10,050,000 Shares VCA Antech, Inc. Common Stock UNDERWRITING AGREEMENT

EXHIBIT 1.1

10,050,000 Shares

VCA Antech, Inc.

Common Stock

UNDERWRITING AGREEMENT

January 29, 2003

▇▇▇▇▇▇▇, ▇▇▇▇▇ & CO.

CREDIT SUISSE FIRST BOSTON LLC

BANC OF AMERICA SECURITIES LLC

▇▇▇▇▇▇▇ ▇▇▇▇▇ BARNEY INC.

▇▇▇▇▇▇▇▇▇ & COMPANY, INC.

▇▇▇▇▇ FARGO SECURITIES, LLC

As Representatives of the several Underwriters,

named in Schedule B hereto,

c/o Goldman, ▇▇▇▇▇ & Co.,

▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇

▇▇▇ ▇▇▇▇, ▇▇▇ ▇▇▇▇ ▇▇▇▇▇

Ladies and Gentlemen:

1. Introductory. VCA Antech, Inc., a Delaware corporation (“Company”), proposes to issue and sell 3,300,000 shares of its common stock, par value $.001 per share (“Securities”), and the stockholders listed on Schedule A (the “Selling Stockholders”) propose severally to sell an aggregate of 6,750,000 outstanding shares of the Securities (such 10,050,000 shares of Securities being hereinafter referred to as the “Firm Securities”). The Company also proposes to issue and sell to the Underwriters (as defined herein), at the option of the Underwriters, an aggregate of not more than 500,000 additional shares of its Securities and the Selling Stockholders also propose to sell to the Underwriters, at the option of the Underwriters, an aggregate of not more than 1,007,500 additional outstanding shares of Company’s Securities, as set forth below (such 1,507,500 additional shares being hereinafter referred to as the “Optional Securities”). The Firm Securities and the Optional Securities are herein collectively called the “Offered Securities”. The Company hereby agrees with the several Underwriters named in Schedule B hereto (“Underwriters”) as follows:

2. Representations and Warranties of the Company and the Selling Stockholders.

(a) The Company represents and warrants to, and agrees with, the several Underwriters that:

(i) A registration statement (No. 333-102439) relating to the Offered Securities, including a form of prospectus, has been filed with the Securities and Exchange Commission (“Commission”) and either (i) has been declared effective under the Securities Act of 1933, as amended (“Act”) and is not proposed to be amended or (ii) is proposed to be amended by amendment or post-effective amendment. If such registration statement (the “initial registration statement”) has been declared effective, either (i) an additional registration statement (the “additional registration statement”) relating to the Offered Securities may have been filed with the Commission pursuant to Rule 462(b) (“Rule 462(b)”) under the Act and, if so filed, has become effective upon filing pursuant to such Rule and the Offered Securities all have been duly registered under the Act pursuant to the initial registration statement and, if applicable, the additional registration statement or (ii) such an additional registration statement is proposed to be filed with the Commission pursuant to Rule 462(b) and will become effective upon filing

pursuant to such Rule and upon such filing the Offered Securities will all have been duly registered under the Act pursuant to the initial registration statement and such additional registration statement. If the Company does not propose to amend the initial registration statement or if an additional registration statement has been filed and the Company does not propose to amend it, and if any post-effective amendment to either such registration statement has been filed with the Commission prior to the execution and delivery of this Agreement, the most recent amendment (if any) to each such registration statement has been declared effective by the Commission or has become effective upon filing pursuant to Rule 462(c) (“Rule 462(c)”) under the Act or, in the case of the additional registration statement, Rule 462(b). For purposes of this Agreement, “Effective Time” with respect to the initial registration statement or, if filed prior to the execution and delivery of this Agreement, the additional registration statement means (i) if the Company has advised the Representatives that it does not propose to amend such registration statement, the date and time as of which such registration statement, or the most recent post-effective amendment thereto (if any) filed prior to the execution and delivery of this Agreement, was declared effective by the Commission or has become effective upon filing pursuant to Rule 462(c), or (ii) if the Company has advised the Representatives that it proposes to file an amendment or post-effective amendment to such registration statement, the date and time as of which such registration statement, as amended by such amendment or post-effective amendment, as the case may be, is declared effective by the Commission. If an additional registration statement has not been filed prior to the execution and delivery of this Agreement but the Company has advised the Representatives that it proposes to file one, “Effective Time” with respect to such additional registration statement means the date and time as of which such registration statement is filed and becomes effective pursuant to Rule 462(b). “Effective Date” with respect to the initial registration statement or the additional registration statement (if any) means the date of the Effective Time thereof. The initial registration statement, as amended at its Effective Time, including all material incorporated by reference therein, including all information contained in the additional registration statement (if any) and deemed to be a part of the initial registration statement as of the Effective Time of the additional registration statement pursuant to the General Instructions of the Form on which it is filed and including all information (if any) deemed to be a part of the initial registration statement as of its Effective Time pursuant to Rule 430A(b) (“Rule 430A(b)”) under the Act, is hereinafter referred to as the “Initial Registration Statement”. Any preliminary prospectus included in the Initial Registration Statement or filed with the Commission pursuant to Rule 424(a) under the Act, including all material incorporated by reference in such preliminary prospectus, is hereinafter referred to as a “Preliminary Prospectus”. The additional registration statement, as amended at its Effective Time, including the contents of the initial registration statement incorporated by reference therein and including all information (if any) deemed to be a part of the additional registration statement as of its Effective Time pursuant to Rule 430A(b), is hereinafter referred to as the “Additional Registration Statement”. The Initial Registration Statement and the Additional Registration Statement are hereinafter referred to collectively as the “Registration Statements” and individually as a “Registration Statement”. The form of prospectus relating to the Offered Securities, as first filed with the Commission pursuant to and in accordance with Rule 424(b) (“Rule 424(b)”) under the Act or (if no such filing is required) as included in a Registration Statement, including all material incorporated by reference in such prospectus, is hereinafter referred to as the “Prospectus”. No document has been or will be prepared or distributed in reliance on Rule 434 under the Act.

(ii) If the Effective Time of the Initial Registration Statement is prior to the execution and delivery of this Agreement: (i) on the Effective Date of the Initial Registration Statement, the Initial Registration Statement conformed in all respects to the requirements of the Act and the rules and regulations of the Commission (“Rules and Regulations”) and did not include any untrue statement of a material fact or omit to state any material fact required to be stated therein or necessary to make the statements therein not misleading, (ii) on the Effective Date of the Additional Registration Statement (if any), each Registration Statement conformed, or will conform, in all respects to the requirements of the Act and the Rules and Regulations and did not include, or will not include, any untrue statement of a material fact and did not omit, or will not omit, to state any material fact required to be stated therein or necessary to make the statements therein not misleading and (iii) on the date of this Agreement, the Initial Registration Statement and, if the Effective Time of the Additional Registration Statement is prior to the execution and delivery of this Agreement, the Additional Registration Statement each conforms, and at the time of filing

of the Prospectus pursuant to Rule 424(b) or (if no such filing is required) at the Effective Date of the Additional Registration Statement in which the Prospectus is included, each Registration Statement and the Prospectus will conform, in all respects to the requirements of the Act and the Rules and Regulations, and neither of such documents includes, or will include, any untrue statement of a material fact or omits, or will omit, to state any material fact required to be stated therein or necessary to make the statements therein not misleading. If the Effective Time of the Initial Registration Statement is subsequent to the execution and delivery of this Agreement: on the Effective Date of the Initial Registration Statement, the Initial Registration Statement and the Prospectus will conform in all respects to the requirements of the Act and the Rules and Regulations, neither of such documents will include any untrue statement of a material fact or will omit to state any material fact required to be stated therein or necessary to make the statements therein not misleading, and no Additional Registration Statement has been or will be filed. The two preceding sentences do not apply to statements in or omissions from a Registration Statement or the Prospectus based upon written information furnished to the Company by any Underwriter through the Representatives specifically for use therein, it being understood and agreed that the only such information is that described as such in Section 7(c) hereof.

(iii) The Company has been duly incorporated and is an existing corporation in good standing under the laws of the State of Delaware, with power and authority (corporate and other) to own its properties and conduct its business as described in the Prospectus; and the Company is duly qualified to do business as a foreign corporation in good standing in all other jurisdictions in which its ownership or lease of property or the conduct of its business requires such qualification.

(iv) Each subsidiary of the Company has been duly incorporated or organized and is an existing corporation or other business organization, as the case may be, in good standing under the laws of the jurisdiction of its incorporation or organization, with power and authority (corporate and other) to own its properties and conduct its business as described in the Prospectus; and each subsidiary of the Company is duly qualified to do business as a foreign corporation or other business organization, as the case may be, in good standing in all other jurisdictions in which its ownership or lease of property or the conduct of its business requires such qualification; all of the issued and outstanding capital stock or other ownership interests of each subsidiary of the Company has been duly authorized and, in the case of each subsidiary that is a corporation, validly issued and is fully paid and nonassessable; and the capital stock or other ownership interest of each subsidiary owned by the Company, directly or through subsidiaries, is owned free from liens, encumbrances and defects, other than the pledge of such capital stock and other ownership interests pursuant to the Credit and Guaranty Agreement, dated as of September 20, 2000 and as amended as of October 24, 2002 (the “Credit Agreement”), by and among the Company, Vicar Operating, Inc. (the “Operating Company”), ▇▇▇▇▇▇▇ Sachs Credit Partners, L.P. (“GSCP”), as sole lead arranger and sole syndication agent, ▇▇▇▇▇ Fargo Bank, N.A. (“▇▇▇▇▇ Fargo”), as administrative agent, and the guarantors and lenders named therein, as amended by the Credit Agreement Amendment (as defined below).

(v) The Offered Securities to be sold by the Company and all other outstanding shares of capital stock of the Company have been duly authorized; all outstanding shares of capital stock of the Company are validly issued, fully paid and nonassessable and conform to the description thereof contained in the Prospectus; when such Offered Securities have been delivered and paid for in accordance with this Agreement on each Closing Date (as defined below), such Offered Securities will have been validly issued, fully paid and nonassessable and will conform to the description thereof contained in the Prospectus; the stockholders of the Company have no preemptive rights with respect to the Securities; and except as disclosed in the Prospectus, there are no outstanding options, warrants or other rights to subscribe for or to purchase, any securities or obligations convertible into, or any contracts or commitments to issue or sell, shares of the Company’s capital stock or any such options, warrants, rights, convertible securities or obligations.

(vi) Except as disclosed in the Prospectus, there are no contracts, agreements or understandings between the Company and any person that would give rise to a valid claim against the Company or any Underwriter for a brokerage commission, finder’s fee or other like payment in connection

with this offering, or, to the Company’s knowledge, any other arrangements, agreements, understandings, payments or issuances with respect to the Company that may affect the Underwriters’ compensation as determined by the National Association of Securities Dealers, Inc. (the “NASD”).

(vii) There are no contracts, agreements or understandings between the Company and any person granting such person the right to require the Company to file a registration statement under the Act with respect to any securities of the Company owned or to be owned by such person, other than the Stockholders Agreement, dated as of September 20, 2000 and as amended on November 27, 2001 and January 9, 2003 (the “Stockholders Agreement”), by and among the Company and the stockholders listed therein, or to require the Company to include such securities in the securities registered pursuant to a Registration Statement or, other than the Stockholders Agreement, in any securities being registered pursuant to any other registration statement filed by the Company under the Act.

(viii) In connection with the filing of the initial registration statement, the Company has complied in all material respects with the terms of the registration rights set forth in the Stockholders Agreement.

(ix) The Offered Securities have been approved for listing on The Nasdaq Stock Market’s National Market, subject to notice of issuance.

(x) No consent, approval, authorization, or order of, or filing with, any governmental agency or body or any court is required for the consummation of the transactions contemplated by this Agreement in connection with the issuance and sale of the Offered Securities by the Company, except such as have been obtained and made under the Act and the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and such as may be required by the NASD and under state securities laws.

(xi) The execution, delivery and performance of this Agreement by the Company, and the issuance and sale of the Offered Securities by the Company will not result in a breach or violation of any of the terms and provisions of, or constitute a default under, any statute, any rule, regulation or order of any governmental agency or body or any court, domestic or foreign, having jurisdiction over the Company or any subsidiary of the Company or any of their properties, or any agreement or instrument to which the Company or any such subsidiary is a party or by which the Company or any such subsidiary is bound or to which any of the properties of the Company or any such subsidiary is subject, or the charter or by-laws of the Company or the charter or by-laws or other organizational documents of any such subsidiary, and the Company has full power and authority to authorize, issue and sell the Offered Securities to be sold by it as contemplated by this Agreement.

(xii) This Agreement has been duly authorized, executed and delivered by the Company.

(xiii) The Amendment, dated as of January 29, 2003, to the Credit Agreement (the “Credit Agreement Amendment”), by and among the Company, the Operating Company, GSCP, ▇▇▇▇▇ Fargo, and the guarantors and lenders named therein, has been duly authorized, executed and delivered by the Company and the Operating Company and is a valid and binding agreement against the Company and the Operating Company, enforceable against each of them in accordance with its terms, except as the enforceability thereof may be limited by bankruptcy, insolvency, reorganization, fraudulent conveyance, moratorium or laws affecting creditors’ rights generally and by general principles of equity (regardless of whether enforcement is considered in a proceeding at law or in equity).

(xiv) Except as disclosed in the Prospectus, the Company and its subsidiaries have good and marketable title to all real properties and all other material properties and assets owned by them, in each case free from liens, encumbrances and defects that would materially affect the value thereof or materially interfere with the use made or to be made thereof by them; and except as disclosed in the Prospectus, the

Company and its subsidiaries hold any leased real or personal property under valid and enforceable leases with no exceptions that would materially interfere with the use made or to be made thereof by them.

(xv) The Company and its subsidiaries possess adequate certificates, authorities or permits issued by appropriate governmental agencies or bodies necessary to conduct the business now operated by them and have not received any notice of proceedings relating to the revocation or modification of any such certificate, authority or permit that, if determined adversely to the Company or any of its subsidiaries, would individually or in the aggregate have a material adverse effect on the condition (financial or other), business, properties or results of operations of the Company and its subsidiaries taken as a whole, adversely affect the ability of the Company to issue the Offered Securities or perform its obligations hereunder, or otherwise affect the validity of the Offered Securities (“Material Adverse Effect”).

(xvi) No labor dispute with the employees of the Company or any subsidiary exists or, to the knowledge of the Company, is imminent that might have a Material Adverse Effect.

(xvii) The Company and its subsidiaries own, possess or can acquire on reasonable terms, adequate trademarks, trade names and other rights to inventions, know-how, patents, copyrights, confidential information and other intellectual property (collectively, “intellectual property rights”) necessary to conduct the business now operated by them, or presently employed by them, and have not received any notice of infringement of or conflict with asserted rights of others with respect to any intellectual property rights that, if determined adversely to the Company or any of its subsidiaries, would individually or in the aggregate have a Material Adverse Effect.

(xviii) Except as disclosed in the Prospectus, neither the Company nor any of its subsidiaries is in violation of any statute, any rule, regulation, decision or order of any governmental agency or body or any court, domestic or foreign, relating to the use, disposal or release of hazardous or toxic substances or the protection or restoration of the environment or human exposure to hazardous or toxic substances (collectively, “environmental laws”), owns or operates any real property contaminated with any substance that is subject to any environmental laws, is liable for any off-site disposal or contamination pursuant to any environmental laws, or is subject to any claim relating to any environmental laws, which violation, contamination, liability or claim would individually or in the aggregate have a Material Adverse Effect; and the Company is not aware of any pending investigation which might lead to such a claim.

(xix) Except as disclosed in the Prospectus under the caption “Business–Legal Proceedings,” neither the Company nor any of its subsidiaries is in violation of any statute, any rule, regulation, decision or order of any governmental agency or body or any court, domestic or foreign, relating to the provision of veterinary medical care by business corporations (collectively, “veterinary medicine laws”), or is subject to any claim relating to any veterinary medicine laws, which violation or claim would individually or in the aggregate have a Material Adverse Effect; and the Company is not aware of any pending investigation which might lead to such a claim.

(xx) Except as disclosed in the Prospectus under the caption “Business–Legal Proceedings,” there are no pending actions, suits or proceedings against or affecting the Company, any of its subsidiaries or any of their respective properties that, if determined adversely to the Company or any of its subsidiaries, would individually or in the aggregate have a Material Adverse Effect; and no such actions, suits or proceedings are threatened or, to the Company’s knowledge, contemplated.

(xxi) The financial statements included in each Registration Statement and the Prospectus present fairly the financial position of the Company and its consolidated subsidiaries as of the dates shown and their results of operations and cash flows for the periods shown, and such financial statements have been prepared in conformity with the generally accepted accounting principles in the United States (“GAAP”) applied on a consistent basis and the schedules included in each Registration Statement present fairly the information required to be stated therein; and the assumptions used in preparing

the pro forma financial data included in each Registration Statement and the Prospectus provide a reasonable basis for presenting the significant effects directly attributable to the transactions or events described therein, the related pro forma adjustments give appropriate effect to those assumptions, and the pro forma data reflect the proper application of those adjustments to the corresponding historical financial statement amounts.

(xxii) Except as disclosed in the Prospectus, since the date of the latest audited financial statements included in the Prospectus, there has been no material adverse change, nor any development or event involving a prospective material adverse change, in the condition (financial or other), business, properties or results of operations of the Company and its subsidiaries taken as a whole, and, except as disclosed in or contemplated by the Prospectus, there has been no dividend or distribution of any kind declared, paid or made by the Company on any class of its capital stock.

(xxiii) The Company is subject to the reporting requirements of either Section 13 or Section 15(d) of the Exchange Act and files reports with the Commission on the Electronic Data Gathering, Analysis, and Retrieval (▇▇▇▇▇) System.

(xxiv) The Company is not and, after giving effect to the offering and sale of the Offered Securities and the application of the proceeds thereof as described in the Prospectus, will not be an “investment company” as defined in the Investment Company Act of 1940.

(xxv) All material Tax returns required to be filed by the Company and each of its subsidiaries have been filed and all such returns are true, complete, and correct in all material respects. All material Taxes that are due or claimed to be due from the Company and each of its subsidiaries have been paid other than those (i) currently payable without penalty or interest or (ii) being contested in good faith and by appropriate proceedings and for which, in the case of both clauses (i) and (ii), adequate reserves have been established on the books and records of the Company and its subsidiaries in accordance with GAAP. There are no material Tax assessments proposed in writing against the Company or any of its subsidiaries. To the Company’s knowledge, the accruals and reserves on the books and records of the Company and its subsidiaries in respect of any material Tax liability for any taxable period not finally determined are adequate to meet any assessments of Tax for any such period. For purposes of this Agreement, the term “Tax” and “Taxes” shall mean all federal, state, local and foreign taxes, and other assessments of a similar nature (whether imposed directly or through withholding), including any interest, additions to tax, or penalties applicable thereto.

(xxvi) Neither the Company nor any of its affiliates (other than any Underwriter, as to which the Company makes no representation), has taken, directly or indirectly, any action designed to cause or result in, or which has constituted or which might reasonably be expected to constitute, the stabilization or manipulation of the price of the shares of the Securities in violation of Regulation M under the Exchange Act.

(xxvii) KPMG LLP, who have certified the financial statements included in each Registration Statement and the Prospectus, are independent public auditors as required by the Act and the Rules and Regulations. The Company and each of its subsidiaries maintains a system of internal accounting controls sufficient to provide reasonable assurances that (i) transactions are executed in accordance with management’s general or specific authorization; (ii) transactions are recorded as necessary to permit preparation of financial statements in conformity with GAAP and to maintain accountability for assets; (iii) access to assets is permitted only in accordance with management’s general or specific authorization; and (iv) the recorded accountability for inventory assets is compared with the existing inventory assets at reasonable intervals and appropriate action is taken with respect to any differences.

(xxviii) The Company and each of its subsidiaries are insured by insurers of recognized financial responsibility against such losses and risks and in such amounts as are prudent and customary in the businesses in which they are engaged; none of the Company or any of its subsidiaries (i) has received

notice from any insurer or agent of such insurer that substantial capital improvements or other material expenditures will have to be made in order to continue such insurance or (ii) has any reason to believe that it will not be able to renew its existing insurance coverage as and when such coverage expires or to obtain similar coverage from similar insurers at a cost that would not have a Material Adverse Effect.

(xxix) The authorized, issued and outstanding capital stock of the Company as of the date indicated is as set forth in the Prospectus under the heading “Actual” under the caption “Capitalization”, and, after giving effect to the incurrence of additional indebtedness and the repayment of certain indebtedness, as set forth under the heading “As Adjusted” under the caption “Capitalization”, and, after giving effect to the sale of the Offered Securities, as set forth under the heading “Pro Forma As Adjusted” under the caption “Capitalization” (except for subsequent issuances, if any, pursuant to this Agreement, pursuant to reservations, agreements or employee benefit plans referred to in the Prospectus or pursuant to the exercise of convertible securities, options or warrants referred to in the Prospectus). Since September 30, 2002, the Company has not issued any securities other than (i) Securities issued pursuant to the exercise of previously outstanding options granted pursuant to its Amended and Restated 1996 Stock Incentive Plan and its 2001 Stock Incentive Plan (collectively, the “Plans”) and (ii) options granted pursuant to the Plans.

(xxx) The industry, statistical and market-related data included in each Registration Statement and the Prospectus are derived from sources that the Company reasonably and in good faith believes to be accurate, reasonable and reliable, and such data agrees with the sources from which they were derived.

(xxxi) The Company is in compliance with all presently applicable provisions of the Employee Retirement Income Security Act of 1974, as amended, including the regulations and published interpretations thereunder (“ERISA”), except where the failure to be in such compliance would not, individually or in the aggregate, have a Material Adverse Effect; no “reportable event” (as defined in ERISA) has occurred with respect to any “pension plan” (as defined in ERISA) for which the Company would have any liability; except for matters that would not, individually or in the aggregate, have a Material Adverse Effect, the Company has not incurred and does not expect to incur liability under (i) Title IV of ERISA with respect to termination of, or withdrawal from, any “pension plan” or (ii) Section 412 or 4971 of the Internal Revenue Code of 1986, as amended, including the regulations and published interpretations thereunder (“Code”); and each “pension plan” for which the Company and each of its subsidiaries would have any liability that is intended to be qualified under Section 401(a) of the Code is so qualified in all material respects and nothing has occurred, whether by action or by failure to act, which would cause the loss of such qualification.

(xxxii) The laboratory internal revenue growth percentage figures included in the Prospectus are computed by the Company in the manner set forth in the Prospectus under the caption “Summary Consolidated Financial Data,” footnote 8, and are based upon estimates and assumptions all of which, taken as a whole, management of the Company believes to be reasonable. In addition, management of the Company has no reason to believe that the sources from which the pre-acquisition historical laboratory revenue information provided to the Company by the sellers of the applicable laboratories and used by the Company in determining laboratory revenue of acquired laboratories are not reliable, reasonable and accurate.

(b) Each Selling Stockholder severally represents and warrants to, and agrees with, the several Underwriters and the Company that:

(i) All consents, approvals, authorizations and orders necessary for the execution and delivery by such Selling Stockholder of this Agreement and the Power of Attorney and the Custody Agreement hereinafter referred to, and for the sale and delivery of the Offered Securities to be sold by such Selling Stockholder hereunder, have been obtained; and such Selling Stockholder has full right, power and authority to enter into this Agreement, the Power of Attorney and the Custody Agreement and

to sell, assign, transfer and deliver the Offered Securities to be sold by such Selling Stockholder hereunder.

(ii) The sale of the Offered Securities to be sold by such Selling Stockholder hereunder and the compliance by such Selling Stockholder with all of the provisions of this Agreement, the Power of Attorney and the Custody Agreement and the consummation of the transactions herein and therein contemplated will not conflict with or result in a breach or violation of any of the terms or provisions of, or constitute a default under, any statute, indenture, mortgage, deed of trust, loan agreement or other agreement or instrument to which such Selling Stockholder is a party or by which such Selling Stockholder is bound or to which any of the property or assets of such Selling Stockholder is subject, nor will such action result in any violation of the provisions of the certificate of incorporation or by-laws of such Selling Stockholder if such Selling Stockholder is a corporation, the partnership agreement of such Selling Stockholder if such Selling Stockholder is a partnership or any statute or any order, rule or regulation of any court or governmental agency or body having jurisdiction over such Selling Stockholder or the property of such Selling Stockholder.

(iii) Such Selling Stockholder has, and immediately prior to each Closing Date (as defined in Section 3 hereof) such Selling Stockholder will have, good and valid title to the Offered Securities to be sold by such Selling Stockholder hereunder, free and clear of all liens, encumbrances, equities or claims; and, upon delivery of such Offered Securities and payment therefor pursuant hereto, good and valid title to such Offered Securities, free and clear of all liens, encumbrances, equities or claims, will pass to the several Underwriters.

(iv) During the period beginning from the date hereof and continuing to and including the date 90 days after the date of the Prospectus, not to offer, sell contract to sell or otherwise dispose of, except as provided hereunder, any securities of the Company that are substantially similar to the Offered Securities, including but not limited to any securities that are convertible into or exchangeable for, or that represent the right to receive, Securities or any such substantially similar securities (other than pursuant to the Plans), without the prior written consent of ▇▇▇▇▇▇▇, ▇▇▇▇▇ & Co. Notwithstanding anything herein to the contrary, ▇▇▇▇▇▇▇, Sachs & Co., Spear, Leeds & ▇▇▇▇▇▇▇ LLC and their respective affiliates may engage in brokerage, investment advisory, investment company, financial advisory, anti-raid advisory, merger advisory, financing, asset management, trading, market making, arbitrage and other similar activities conducted in the ordinary course of its and its affiliates’ business.

(v) Such Selling Stockholder has not taken and will not take, directly or indirectly, any action which is designed to or which has constituted or which might reasonably be expected to cause or result in stabilization or manipulation of the price of any security of the Company to facilitate the sale or resale of the Offered Securities.

(vi) All information provided by such Selling Stockholder for inclusion in any Registration Statement, any Preliminary Prospectus, the Prospectus or any amendment or supplement thereto expressly for use therein is, and on the Effective Date and each Closing Date will be, true, correct and complete in all material respects, and does not, and on the Effective Date and each Closing Date will not, contain any untrue statement of a material fact or omit to state any material fact required to be stated therein or necessary to make such information not misleading.

(vii) In order to document the Underwriters’ compliance with the reporting and withholding provisions of the Tax Equity and Fiscal Responsibility Act of 1982 with respect to the transactions herein contemplated, such Selling Stockholder will deliver to the Custodian (as hereinafter defined) prior to or at each Closing Date (as hereinafter defined) a properly completed and executed United States Treasury Department Form W-9 (or other applicable form or statement specified by Treasury Department regulations in lieu thereof).

(viii) Certificates in negotiable form representing all of the Offered Securities to be sold by such Selling Stockholder hereunder have been placed in custody under a Custody Agreement, in the form heretofore furnished to the Representatives (the “Custody Agreement”), duly executed and delivered by such Selling Stockholder to U.S. Stock Transfer Corporation, as custodian (the “Custodian”), and such Selling Stockholder has duly executed and delivered a Power of Attorney, in the form heretofore furnished to the Representatives (the “Power of Attorney”), appointing the persons indicated in Schedule A hereto, and each of them, as such Selling Stockholder’s attorneys-in-fact (the “Attorneys-in-Fact”) with authority to execute and deliver this Agreement on behalf of such Selling Stockholder, to determine the purchase price to be paid by the Underwriters to the Selling Stockholders as provided in Section 3 hereof, to authorize the delivery of the Offered Securities to be sold by such Selling Stockholder hereunder and otherwise to act on behalf of such Selling Stockholder in connection with the transactions contemplated by this Agreement and the Custody Agreement.

(ix) The Offered Securities represented by the certificates held in custody for such Selling Stockholder under the Custody Agreement are subject to the interests of the Underwriters hereunder; the arrangements made by such Selling Stockholder for such custody, and the appointment by such Selling Stockholder of the Attorneys-in-Fact by the Power of Attorney, are to that extent irrevocable; the obligations of the Selling Stockholders hereunder shall not be terminated by operation of law, whether by the death or incapacity of any individual Selling Stockholder or, in the case of an estate or trust, by the death or incapacity of any executor or trustee or the termination of such estate or trust, or in the case of a partnership or corporation, by the dissolution of such partnership or corporation, or by the occurrence of any other event; if any individual Selling Stockholder or any such executor or trustee should die or become incapacitated, or if any such estate or trust should be terminated, or if any such partnership or corporation should be dissolved, or if any other such event should occur, before the delivery of the Offered Securities hereunder, certificates representing the Offered Securities shall be delivered by or on behalf of the Selling Stockholders in accordance with the terms and conditions of this Agreement and of the Custody Agreements; and actions taken by the Attorneys-in-Fact pursuant to the Powers of Attorney shall be as valid as if such death, incapacity, termination, dissolution or other event had not occurred, regardless of whether or not the Custodian, the Attorneys-in-Fact, or any of them, shall have received notice of such death, incapacity, termination, dissolution or other event.

3. Purchase, Sale and Delivery of Offered Securities. On the basis of the representations, warranties and agreements herein contained, but subject to the terms and conditions herein set forth, the Company and each Selling Stockholder agree, severally and not jointly, to sell to each Underwriter, and each Underwriter agrees, severally and not jointly, to purchase from the Company and each Selling Stockholder, at a purchase price of $14.49 per share, that number of Firm Securities (rounded up or down, as determined by ▇▇▇▇▇▇▇, ▇▇▇▇▇ & Co. in its discretion, in order to avoid fractions) obtained by multiplying 3,300,000 shares of Firm Securities in the case of the Company and the number of shares of Firm Securities set forth opposite the name of such Selling Stockholder in Schedule A hereto, in the case of a Selling Stockholder, in each case by a fraction the numerator of which is the number of shares of Firm Securities set forth opposite the name of such Underwriter in Schedule B hereto and the denominator of which is the total number of shares of Firm Securities.

The Company and the Custodian will deliver the Firm Securities to the Representatives for the accounts of the Underwriters against payment of the purchase price in Federal (same day) funds by official bank check or checks or wire transfer to an account at a bank acceptable to ▇▇▇▇▇▇▇, Sachs & Co. drawn to the order of the Company in the case of 3,300,000 shares of Firm Securities and to the Custodian in the case of 6,750,000 shares of Firm Securities, at the office of Akin, Gump, Strauss, ▇▇▇▇▇ & ▇▇▇▇, L.L.P., ▇▇▇▇ ▇▇▇▇▇▇▇ ▇▇▇▇ ▇▇▇▇, ▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇, at 10:00 A.M., New York time, on February 4, 2003, or at such other time not later than seven full business days thereafter as ▇▇▇▇▇▇▇, Sachs & Co. and the Company determine, such time being herein referred to as the “First Closing Date”. For purposes of Rule 15c6-1 under the Exchange Act, the First Closing Date (if later than the otherwise applicable settlement date) shall be the settlement date for payment of funds and delivery of securities for all the Offered Securities sold pursuant to the offering. The certificates for the Firm

Securities to be delivered will be in definitive form, in such denominations and registered in such names as ▇▇▇▇▇▇▇, ▇▇▇▇▇ & Co. requests and will be made available for checking and packaging at the above office of Akin, Gump, Strauss, ▇▇▇▇▇ & ▇▇▇▇, L.L.P. at least 24 hours prior to the First Closing Date.

In addition, upon written notice from ▇▇▇▇▇▇▇, Sachs & Co. given to the Company and the Selling Stockholders from time to time not more than 30 days subsequent to the date of the Prospectus, the Underwriters may purchase all or less than all of the Optional Securities at the purchase price per Security to be paid for the Firm Securities. The Company and the Selling Stockholders agree, severally and not jointly, to sell to the Underwriters the respective numbers of shares of Optional Securities obtained by multiplying the number of shares of Optional Securities specified in such notice by a fraction the numerator of which is 500,000 in the case of the Company and the number of shares set forth opposite the names of such Selling Stockholders in Schedule A hereto under the caption “Number of Optional Securities to be Sold” in the case of the Selling Stockholders and the denominator of which is the total number of Optional Securities (subject to adjustment by ▇▇▇▇▇▇▇, ▇▇▇▇▇ & Co. to eliminate fractions). Such Optional Securities shall be purchased from the Company and each Selling Stockholder for the account of each Underwriter in the same proportion as the number of shares of Firm Securities set forth opposite such Underwriter’s name bears to the total number of shares of Firm Securities (subject to adjustment by ▇▇▇▇▇▇▇, Sachs & Co. to eliminate fractions) and may be purchased by the Underwriters only for the purpose of covering over-allotments made in connection with the sale of the Firm Securities. No Optional Securities shall be sold or delivered unless the Firm Securities previously have been, or simultaneously are, sold and delivered. The right to purchase the Optional Securities or any portion thereof may be exercised from time to time and to the extent not previously exercised may be surrendered and terminated at any time upon notice by ▇▇▇▇▇▇▇, ▇▇▇▇▇ & Co. to the Company and the Selling Stockholders.

Each time for the delivery of and payment for the Optional Securities, being herein referred to as an “Optional Closing Date”, which may be the First Closing Date (the First Closing Date and each Optional Closing Date, if any, being sometimes referred to as a “Closing Date”), shall be determined by ▇▇▇▇▇▇▇, Sachs & Co. but shall be not later than five full business days after written notice of election to purchase Optional Securities is given. The Company and the Custodian will deliver the Optional Securities being purchased on each Optional Closing Date to the Representatives for the accounts of the several Underwriters against payment of the purchase price therefor in Federal (same day) funds by official bank check or checks or wire transfer to an account at a bank acceptable to ▇▇▇▇▇▇▇, ▇▇▇▇▇ & Co. drawn to the order of the Company with respect to the Optional Securities sold by the Company and the Custodian with respect to the Optional Securities sold by the Selling Stockholders, at the above office of Akin, Gump, Strauss, ▇▇▇▇▇ & ▇▇▇▇, L.L.P. The certificates for the Optional Securities being purchased on each Optional Closing Date will be in definitive form, in such denominations and registered in such names as ▇▇▇▇▇▇▇, Sachs & Co. requests upon reasonable notice prior to such Optional Closing Date and will be made available for checking and packaging at the above office of Akin, Gump, Strauss, ▇▇▇▇▇ & ▇▇▇▇, L.L.P. at a reasonable time in advance of such Optional Closing Date.

4. Offering by Underwriters. It is understood that the several Underwriters propose to offer the Offered Securities for sale to the public as set forth in the Prospectus.

5. Certain Agreements of the Company and the Selling Stockholders. The Company agrees with the several Underwriters and the Selling Stockholders that:

(a) If the Effective Time of the Initial Registration Statement is prior to the execution and delivery of this Agreement, the Company will file the Prospectus with the Commission pursuant to and in accordance with subparagraph (1) (or, if applicable and if consented to by ▇▇▇▇▇▇▇, Sachs & Co., subparagraph (4)) of Rule 424(b) not later than the earlier of (A) the second business day following the execution and delivery of this Agreement or (B) the fifteenth business day after the Effective Date of the Initial Registration Statement.

The Company will advise ▇▇▇▇▇▇▇, ▇▇▇▇▇ & Co. promptly of any such filing pursuant to Rule 424(b). If the Effective Time of the Initial Registration Statement is prior to the execution and delivery of this Agreement and an additional registration statement is necessary to register a portion of the Offered Securities under the Act but the Effective Time thereof has not occurred as of such execution and delivery, the Company will file the additional registration statement or, if filed, will file a post-effective amendment thereto with the Commission pursuant to and in accordance with Rule 462(b) on or prior to 10:00 P.M., New York time, on the date of this Agreement or, if earlier, on or prior to the time the Prospectus is printed and distributed to any Underwriter, or will make such filing at such later date as shall have been consented to by ▇▇▇▇▇▇▇, Sachs & Co.

(b) The Company will advise ▇▇▇▇▇▇▇, ▇▇▇▇▇ & Co. promptly of any proposal to amend or supplement the initial or any additional registration statement as filed or the related prospectus or the Initial Registration Statement, the Additional Registration Statement (if any) or the Prospectus and will not effect such amendment or supplementation without the consent of ▇▇▇▇▇▇▇, Sachs & Co.; and the Company will also advise ▇▇▇▇▇▇▇, ▇▇▇▇▇ & Co. promptly of the effectiveness of each Registration Statement (if its Effective Time is subsequent to the execution and delivery of this Agreement) and of any amendment or supplementation of a Registration Statement or the Prospectus and of the institution by the Commission of any stop order proceedings in respect of a Registration Statement and will use its best efforts to prevent the issuance of any such stop order and to obtain as soon as possible its lifting, if issued.

(c) If, at any time when a prospectus relating to the Offered Securities is required to be delivered under the Act in connection with sales by any Underwriter or dealer, any event occurs as a result of which the Prospectus as then amended or supplemented would include an untrue statement of a material fact or omit to state any material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading, or if it is necessary at any time to amend the Prospectus to comply with the Act, the Company will promptly notify ▇▇▇▇▇▇▇, Sachs & Co. of such event and will promptly prepare and file with the Commission, at its own expense, an amendment or supplement which will correct such statement or omission or an amendment which will effect such compliance. Neither ▇▇▇▇▇▇▇, ▇▇▇▇▇ & Co.’s consent to, nor the Underwriters’ delivery of, any such amendment or supplement shall constitute a waiver of any of the conditions set forth in Section 6.

(d) As soon as practicable, but not later than the Availability Date (as defined below), the Company will make generally available to its security holders an earnings statement covering a period of at least 12 months beginning after the Effective Date of the Initial Registration Statement (or, if later, the Effective Date of the Additional Registration Statement) which will satisfy the provisions of Section 11(a) of the Act. For the purpose of the preceding sentence, “Availability Date” means the 45th day after the end of the fourth fiscal quarter following the fiscal quarter that includes such Effective Date, except that, if such fourth fiscal quarter is the last quarter of the Company’s fiscal year, “Availability Date” means the 90th day after the end of such fourth fiscal quarter.

(e) The Company will furnish to the Representatives copies of each Registration Statement (three of which will be signed and will include all exhibits), each related Preliminary Prospectus, and, so long as a prospectus relating to the Offered Securities is required to be delivered under the Act in connection with sales by any Underwriter or dealer, the Prospectus and all amendments and supplements to such documents, in each case in such quantities as ▇▇▇▇▇▇▇, Sachs & Co. requests. The Prospectus shall be so furnished on or prior to 3:00 P.M., New York time, on the business day following the later of the execution and delivery of this Agreement or the Effective Time of the Initial Registration Statement. All other documents shall be so furnished as soon as available. The Company will pay the expenses of printing and distributing to the Underwriters all such documents.

(f) The Company will arrange for the qualification of the Offered Securities for sale under the laws of such jurisdictions as ▇▇▇▇▇▇▇, ▇▇▇▇▇ & Co. designates and will continue such qualifications in effect so long as required for the distribution.

(g) For a period of 90 days after the date of the public offering of the Offered Securities, the Company will not offer, sell, contract to sell, pledge or otherwise dispose of, directly or indirectly, or file with the Commission a registration statement under the Act relating to, any additional shares of its Securities or securities convertible into or exchangeable or exercisable for any shares of its Securities, or publicly disclose the intention to make any such offer, sale, pledge, disposition or filing, without the prior written consent of ▇▇▇▇▇▇▇, Sachs & Co., except issuances of Securities pursuant to the exercise of warrants or options outstanding on the date hereof, grants of employee stock options pursuant to the terms of the Plans, or issuances of Securities pursuant to the exercise of such options.

(h) The Company will pay all expenses incident to the performance of its obligations under this Agreement, for any filing fees and other expenses (including fees and disbursements of counsel) incurred in connection with qualification of the Offered Securities for sale under the laws of such jurisdictions as ▇▇▇▇▇▇▇, ▇▇▇▇▇ & Co. designates and the printing of memoranda relating thereto, for the filing fee incident to, the review by the NASD of the Offered Securities, and for expenses incurred in distributing any Preliminary Prospectus and the Prospectus (including any amendments and supplements thereto) to the Underwriters. The Selling Stockholders agree to pay any transfer taxes on the sale by the Selling Stockholders of the Offered Securities to the Underwriters.

(i) The Company shall use its best efforts to list, subject to notice of issuance, the Offered Securities on The Nasdaq Stock Market’s National Market.

6. Conditions of the Obligations of the Underwriters. The obligations of the several Underwriters to purchase and pay for the Firm Securities on the First Closing Date and the Optional Securities to be purchased on each Optional Closing Date will be subject to the accuracy of the representations and warranties on the part of the Company herein, to the accuracy of the statements of Company officers made pursuant to the provisions hereof, to the performance by the Company of its obligations hereunder and to the following additional conditions precedent:

(a) The Representatives shall have received a letter, dated the date of delivery thereof (which, if the Effective Time of the Initial Registration Statement is prior to the execution and delivery of this Agreement, shall be on or prior to the date of this Agreement or, if the Effective Time of the Initial Registration Statement is subsequent to the execution and delivery of this Agreement, shall be prior to the filing of the amendment or post-effective amendment to the registration statement to be filed shortly prior to such Effective Time), of KPMG LLP confirming that they are independent public accountants within the meaning of the Act and the applicable published Rules and Regulations thereunder and stating to the effect that:

i. in their opinion the financial statements and schedules examined by them and included in the Registration Statements comply as to form in all material respects with the applicable accounting requirements of the Act and the related published Rules and Regulations;

ii. they have performed the procedures specified by the American Institute of Certified Public Accountants for a review of interim financial information as described in Statement of Auditing Standards No. 71, Interim Financial Information, on the unaudited financial statements included in the Registration Statements;

iii. on the basis of the review referred to in clause (ii) above, a reading of the latest available interim financial statements of the Company, inquiries of officials of the Company who have responsibility for financial and accounting matters and other specified procedures, nothing came to their attention that caused them to believe that:

(A) the unaudited financial statements included in the Registration Statements do not comply as to form in all material respects with the applicable accounting requirements of

the Act and the related published Rules and Regulations or any material modifications should be made to such unaudited financial statements for them to be in conformity with GAAP;

(B) at the date of the latest available balance sheet read by such accountants, or at a subsequent specified date not more than three business days prior to the date of this Agreement, there was any change in the capital stock or any increase in short-term indebtedness or long-term debt of the Company and its consolidated subsidiaries or, at the date of the latest available balance sheet read by such accountants, there was any decrease in consolidated net current assets or net assets, as compared with amounts shown on the latest balance sheet included in the Prospectus; or

(C) for the period from the closing date of the latest income statement included in the Prospectus to the closing date of the latest available income statement read by such accountants there were any decreases, as compared with the corresponding period of the previous year, in consolidated net revenue or net operating income, or in the total or per share amounts of consolidated income before extraordinary items or net income, except in all cases set forth in clauses (B) and (C) above for changes, increases or decreases which the Prospectus discloses have occurred or may occur or which are described in such letter; and

iv. they have compared specified dollar amounts (or percentages derived from such dollar amounts) and other financial information contained in the Registration Statements (in each case to the extent that such dollar amounts, percentages and other financial information are derived from the general accounting records of the Company and its subsidiaries subject to the internal controls of the Company’s accounting system or are derived directly from such records by analysis or computation) with the results obtained from inquiries, a reading of such general accounting records and other procedures specified in such letter and have found such dollar amounts, percentages and other financial information to be in agreement with such results, except as otherwise specified in such letter.

For purposes of this subsection, (i) if the Effective Time of the Initial Registration Statement is subsequent to the execution and delivery of this Agreement, “Registration Statements” shall mean the initial registration statement as proposed to be amended by the amendment or post-effective amendment to be filed shortly prior to its Effective Time, (ii) if the Effective Time of the Initial Registration Statement is prior to the execution and delivery of this Agreement but the Effective Time of the Additional Registration Statement is subsequent to such execution and delivery, “Registration Statements” shall mean the Initial Registration Statement and the additional registration statement as proposed to be filed or as proposed to be amended by the post-effective amendment to be filed shortly prior to its Effective Time, and (iii) “Prospectus” shall mean the prospectus included in the Registration Statements. All financial statements and schedules included in material incorporated by reference into the Prospectus shall be deemed included in the Registration Statement for purposes of this subsection.

(b) If the Effective Time of the Initial Registration Statement is not prior to the execution and delivery of this Agreement, such Effective Time shall have occurred not later than 10:00 P.M., New York time, on the date of this Agreement or such later date as shall have been consented to by ▇▇▇▇▇▇▇, Sachs & Co. If the Effective Time of the Additional Registration Statement (if any) is not prior to the execution and delivery of this Agreement, such Effective Time shall have occurred not later than 10:00 P.M., New York time, on the date of this Agreement or, if earlier, the time the Prospectus is printed and distributed to any Underwriter, or shall have occurred at such later date as shall have been consented to by ▇▇▇▇▇▇▇, ▇▇▇▇▇ & Co. If the Effective Time of the Initial Registration Statement is prior to the execution and delivery of this Agreement, the Prospectus shall have been filed with the Commission in accordance with the Rules and Regulations and Section 5(a) of this Agreement. Prior to such Closing Date, no stop order suspending the effectiveness of a Registration Statement shall have been issued and no proceedings for that purpose shall have been instituted or, to the knowledge of any Selling Stockholder, the Company or the Representatives, shall be contemplated by the Commission.

(c) Subsequent to the execution and delivery of this Agreement, there shall not have occurred (i) any change, or any development or event involving a prospective change, in the condition (financial or other), business, properties or results of operations of the Company and its subsidiaries taken as one enterprise which, in the judgment of a majority in interest of the Underwriters including the Representatives, is material and adverse and makes it impractical or inadvisable to proceed with completion of the public offering or the sale of and payment for the Offered Securities; (ii) any downgrading in the rating of any debt securities of the Company by any “nationally recognized statistical rating organization” (as defined for purposes of Rule 436(g) under the Act), or any public announcement that any such organization has under surveillance or review its rating of any debt securities of the Company (other than an announcement with positive implications of a possible upgrading, and no implication of a possible downgrading, of such rating); (iii) any change in U.S. or international financial, political or economic conditions or currency exchange rates or exchange controls as would, in the judgment of a majority in interest of the Underwriters including the Representatives, be likely to prejudice materially the success of the proposed issue, sale or distribution of the Offered Securities, whether in the primary market or in respect of dealings in the secondary market; (iv) any material suspension or material limitation of trading in securities generally on the New York Stock Exchange, or any setting of minimum prices for trading on such exchange, or any suspension of trading of any securities of the Company on any exchange or in the over-the-counter market; (v) any banking moratorium declared by U.S. Federal or New York authorities; (vi) any major disruption of settlements of securities; or (vii) any attack on, outbreak or escalation of hostilities or acts of terrorism involving the United States, any declaration of war by Congress or any other national or international calamity or emergency if, in the judgment of a majority in interest of the Underwriters including the Representatives, the effect of any such attack, outbreak, escalation, act, declaration, calamity or emergency makes it impractical or inadvisable to proceed with completion of the public offering or the sale of and payment for the Offered Securities.

(d) The Representatives shall have received an opinion, dated such Closing Date, of Akin, Gump, Strauss, ▇▇▇▇▇ & ▇▇▇▇, L.L.P., counsel for the Company, to the effect that:

i. The Company is a corporation duly incorporated and validly existing in good standing under the laws of the State of Delaware, with corporate power and authority to own its properties and conduct its business as described in the Prospectus; and the Company is duly qualified to do business as a foreign corporation in good standing in the jurisdictions identified on a schedule attached to such counsel’s opinion.

ii. The Operating Company is a corporation duly incorporated and validly existing in good standing under the laws of the State of Delaware, with corporate power and authority to own its properties and conduct its business as described in the Prospectus; and the Operating Company is duly qualified to do business as a foreign corporation in good standing in the jurisdictions identified on a schedule attached to such counsel’s opinion.

iii. The Company has authorized capital stock as set forth in the Prospectus. Except as set forth in the Prospectus, to such counsel’s knowledge, there are no outstanding options warrants or other rights to subscribe for or to purchase, any securities or obligations convertible into, or any contracts or commitments to issue or sell, shares of the Company’s capital stock or any such options, warrants, rights, convertible securities or obligations.

iv. The Offered Securities delivered by the Company on such Closing Date have been duly authorized and, when issued and delivered to the Underwriters against payment therefor in accordance with the Underwriting Agreement, will be validly issued, fully paid and nonassessable and will conform to the description thereof contained in the Prospectus; all other outstanding shares of Securities have been duly authorized and validly issued, are fully paid and nonassessable, and conform to the description thereof in the Prospectus; and the stockholders of the Company have no preemptive rights with respect to the Offered Securities under the Delaware General Corporation Law or any contract filed as an

exhibit to the Registration Statement or, to such counsel’s knowledge, any other agreement to which the Company is a party or by which the Company is bound.

v. There are no contracts, agreements or understandings known to such counsel between the Company and any person granting such person the right to: (i) require the Company to file a registration statement under the Act with respect to any securities of the Company owned or to be owned by such person, other than the Stockholders Agreement or (ii) other than pursuant to the rights granted in the Stockholders Agreement, require the Company to include such securities in (a) the securities registered pursuant to the Registration Statement or (b) any securities being registered pursuant to any other registration statement filed by the Company under the Act.

vi. The Company is not an “investment company” as defined in the Investment Company Act of 1940 and, after giving effect to the offering and sale of the Offered Securities and the application of the proceeds thereof as described in the Prospectus, will not be an “investment company”.

vii. No consent, approval, authorization or order of, or filing with, any governmental agency or body or any court is required under any of the Included Laws (as defined in such counsel’s opinion) to be obtained or made by the Company for the due execution and delivery of the Underwriting Agreement by the Company and the performance of its obligations thereunder in connection with the sale of the Offered Securities by the Company, except such as have been obtained or made under the Act and the Exchange Act and such as may be required under state securities laws and in connection with the listing of the Offered Securities on the Nasdaq National Market.

viii. The execution, delivery and performance of the Underwriting Agreement by the Company do not, and the consummation by the Company of the transactions therein contemplated will not, (a) result in a violation of any law, rule or regulation of any Included Law, (b) result in a violation of any order, writ, judgment or decree known to such counsel and applicable to the Company or any of its subsidiaries or any of their properties, (c) result in a violation of the certificate of incorporation or bylaws or similar charter documents of the Company or any of its subsidiaries, (d) breach, result in the acceleration of, or entitle any party to accelerate under any agreement or instrument filed as an exhibit to the Registration Statement or (e) to such counsel’s knowledge, breach or result in the acceleration of, or entitle any party to accelerate, any other agreement by which any of the properties of the Company or any of its subsidiaries is bound, except for such breaches as would not have a Material Adverse Effect.

ix. The Initial Registration Statement was declared effective under the Act as of the date and time specified in such opinion, the Additional Registration Statement (if any) was filed and became effective under the Act as of the date and time (if determinable) specified in such opinion, the Prospectus was filed with the Commission pursuant to Rule 424(b) as of the date and time (if determinable) specified in such opinion, and, to such counsel’s knowledge, no stop order suspending the effectiveness of a Registration Statement or any part thereof has been issued and no proceedings for that purpose have been instituted or are pending or contemplated under the Act, and each Registration Statement and the Prospectus, and each amendment or supplement thereto, as of their respective effective or issue dates, complied as to form in all material respects with the requirements of the Act and the Rules and Regulations.

x. Such counsel has no reason to believe that any part of a Registration Statement or any amendment thereto, as of its effective date or as of such Closing Date, contained any untrue statement of a material fact or omitted to state any material fact required to be stated therein or necessary to make the statements therein not misleading or that the Prospectus or any amendment or supplement thereto, as of its issue date or as of such Closing Date, contained any untrue statement of a material fact or omitted to state any material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; the descriptions in the Registration Statements and Prospectus of statutes, legal and governmental proceedings and contracts and other documents are accurate and fairly present the information required to be shown; and such counsel do not

know of any legal or governmental proceedings required to be described in a Registration Statement or the Prospectus which are not described as required or of any contracts or documents of a character required to be described in a Registration Statement or the Prospectus or to be filed as exhibits to a Registration Statement which are not described and filed as required; it being understood that such counsel need express no opinion as to the financial statements or other financial data contained in the Registration Statements or the Prospectus.

xi. The descriptions in the Registration Statements and Prospectus under the captions “Management,” “Description of Capital Stock,” “Description of Certain Indebtedness”, “Certain Transactions with Directors and Executive Officers”, “Management Services Agreement”, “Investment in ▇▇▇▇▇▇.▇▇▇”, “Redemption of Preferred Stock and Repayment of Senior Notes and Senior Subordinated Notes” and “Purchase of Common Stock in VCA’s Initial Public Offering”, “Related Party Vendors” and “Related Party Director” of statutes, legal and governmental proceedings and contracts and other documents are accurate in all material respects and fairly present the information required to be shown; and such counsel does not know of any legal or governmental proceedings required to be described in a Registration Statement or the Prospectus which are not described as required or of any contracts or documents of a character required to be described in a Registration Statement or the Prospectus or to be filed as exhibits to a Registration Statement which are not described and filed as required; it being understood that such counsel need express no opinion as to the financial statements or other financial data contained in the Registration Statements or the Prospectus.

xii. The Underwriting Agreement has been duly authorized, executed and delivered by the Company.

xiii. The Credit Agreement Amendment has been duly authorized, executed and delivered by each of the Company and the Operating Company and constitutes the valid and binding obligation of each of the Company and the Operating Company enforceable against each of the Company and the Operating Company in accordance with its terms, except as the enforceability thereof may be limited by bankruptcy, insolvency, reorganization, fraudulent conveyance, moratorium or laws affecting creditors’ rights generally and by general principles of equity (regardless of whether enforcement is considered in a proceeding at law or in equity).

(e) The Representatives shall have received from the respective counsel for each of the Selling Stockholders their written opinion with respect to each of the Selling Stockholders for whom they are acting as counsel (a draft of each such opinion is attached as Annex I hereto), dated such Closing Date, in form and substance satisfactory to the Representatives, to the effect that:

(i) A Power of Attorney and a Custody Agreement have been duly executed and delivered by such Selling Stockholder and constitute valid and binding agreements of such Selling Stockholder in accordance with their terms.

(ii) This Agreement has been duly executed and delivered by or on behalf of such Selling Stockholder; and the sale of the Offered Securities to be sold by such Selling Stockholder hereunder and the compliance by such Selling Stockholder with all of the provisions of this Agreement, the Power of Attorney and the Custody Agreement and the consummation of the transactions herein and therein contemplated will not conflict with or result in a breach or violation of any terms or provisions of, or constitute a default under, any statute, indenture, mortgage, deed of trust, loan agreement or other agreement or instrument known to such counsel to which such Selling Stockholder is a party or by which such Selling Stockholder is bound or to which any of the property or assets of such Selling Stockholder is subject, nor will such action result in any violation of the provisions of the certificate of incorporation or by-laws of such Selling Stockholder if such Selling Stockholder is a corporation, the partnership agreement of such Selling Stockholder if such Selling Stockholder is a partnership or any order, rule or regulation known to such counsel of any court or governmental agency or body having jurisdiction over such Selling Stockholder or the property of such Selling Stockholder.

(iii) No consent, approval, authorization or order of any court or governmental agency or body is required for the consummation of the transactions contemplated by this Agreement in connection with the Offered Securities to be sold by such Selling Stockholder hereunder, except those which have been duly obtained and are in full force and effect, such as have been obtained under the Act and such as may be required under state securities or Blue Sky laws in connection with the purchase and distribution of such Offered Securities by the Underwriters.

(iv) Immediately prior to such Closing Date, such Selling Stockholder had good and valid title to the Offered Securities to be sold at such Closing Date by such Selling Stockholder under this Agreement, free and clear of all liens, encumbrances, equities or claims, and full right, power and authority to sell, assign, transfer and deliver the Offered Securities to be sold by such Selling Stockholder hereunder.

(v) Good and valid title to such Offered Securities, free and clear of all liens, encumbrances, equities or claims, has been transferred to each of the several Underwriters.

(f) The Representatives shall have received from Skadden, Arps, Slate, ▇▇▇▇▇▇▇ & ▇▇▇▇ LLP, counsel for the Underwriters, such opinion or opinions, dated such Closing Date, with respect to the incorporation of the Company, the validity of the Offered Securities delivered by the Company on such Closing Date, the Registration Statements, the Prospectus and other related matters as the Representatives may require, and the Company shall have furnished to such counsel such documents as they request for the purpose of enabling them to pass upon such matters.

(g) The Representatives shall have received a certificate, dated such Closing Date, of the President or any Vice President and a principal financial or accounting officer of the Company in which such officers, to the best of their knowledge after reasonable investigation, shall state that: the representations and warranties of the Company in this Agreement are true and correct; the Company has complied with all agreements and satisfied all conditions on its part to be performed or satisfied hereunder at or prior to such Closing Date; no stop order suspending the effectiveness of any Registration Statement has been issued and no proceedings for that purpose have been instituted or are pending or contemplated by the Commission; the Additional Registration Statement (if any) satisfying the requirements of subparagraphs (1) and (3) of Rule 462(b) was filed pursuant to Rule 462(b), including payment of the applicable filing fee in accordance with Rule 111(a) or (b) under the Act, prior to the time the Prospectus was printed and distributed to any Underwriter; and, subsequent to the dates of the most recent financial statements in the Prospectus, there has been no material adverse change, nor any development or event involving a prospective material adverse change, in the condition (financial or other), business, properties or results of operations of the Company and its subsidiaries taken as a whole except as set forth in or contemplated by the Prospectus or as described in such certificate.

(h) The Representatives shall have received a letter, dated such Closing Date, of KPMG LLP which meets the requirements of subsection (a) of this Section, except that the specified date referred to in such subsection will be a date not more than three days prior to such Closing Date for the purposes of this subsection.

(i) On or prior to the date of this Agreement, the Representatives shall have received lockup letters from each of the executive officers and directors of the Company.

(j) Receipt by the Representatives of evidence satisfactory to them that the Company shall have obtained the Credit Agreement Amendment on terms previously disclosed to the Representatives and for the purposes described in the Prospectus.

(k) The Custodian will deliver to ▇▇▇▇▇▇▇, Sachs & Co. a letter stating that they will deliver to each Selling Stockholder a United States Treasury Department Form 1099 (or other

applicable form or statement specified by the United States Treasury Department regulations in lieu thereof) on or before January 31 of the year following the date of this Agreement.

(l) Receipt by the Representatives of evidence satisfactory to them that the Company shall have obtained from each holder of the Company’s 15.5% Senior Notes due 2010 (the “Notes”), an acknowledgement of the optional redemption of such Notes by the Company and a waiver of the notice provisions contained in the Indenture, dated as of September 20, 2000 and as amended as of January 7, 2003, relating to the Notes, on terms previously disclosed to the Representatives.

The Selling Stockholders and the Company will furnish the Representatives with such conformed copies of such opinions, certificates, letters and documents as the Representatives reasonably request. ▇▇▇▇▇▇▇, ▇▇▇▇▇ & Co. may in its sole discretion waive on behalf of the Underwriters compliance with any conditions to the obligations of the Underwriters hereunder, whether in respect of an Optional Closing Date or otherwise.

7. Indemnification and Contribution.

(a) The Company will indemnify and hold harmless each Underwriter, its partners, directors and officers and each person, if any, who controls such Underwriter within the meaning of Section 15 of the Act, against any losses, claims, damages or liabilities, joint or several, to which such Underwriter may become subject, under the Act or otherwise, insofar as such losses, claims, damages or liabilities (or actions in respect thereof) arise out of or are based upon any untrue statement or alleged untrue statement of any material fact contained in any Registration Statement, the Prospectus, or any amendment or supplement thereto, or any related Preliminary Prospectus, or arise out of or are based upon the omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, and will reimburse each Underwriter for any legal or other expenses reasonably incurred by such Underwriter in connection with investigating or defending any such loss, claim, damage, liability or action as such expenses are incurred; provided, however, that the Company will not be liable in any such case to the extent that any such loss, claim, damage or liability arises out of or is based upon an untrue statement or alleged untrue statement in or omission or alleged omission from any of such documents in reliance upon and in conformity with written information furnished to the Company by any Underwriter through the Representatives specifically for use therein, it being understood and agreed that the only such information furnished by any Underwriter consists of the information described as such in subsection (c) below.

(b) Each of the Selling Stockholders will indemnify and hold harmless each Underwriter against any losses, claims, damages or liabilities, joint or several, to which such Underwriter may become subject, under the Act or otherwise, insofar as such losses, claims, damages or liabilities (or actions in respect thereof) arise out of or are based upon an untrue statement or alleged untrue statement of a material fact contained in any Preliminary Prospectus, any Registration Statement or the Prospectus, or any amendment or supplement thereto, or arise out of or are based upon the omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, in each case to the extent, but only to the extent, that such untrue statement or alleged untrue statement or omission or alleged omission was made in any Preliminary Prospectus, any Registration Statement or the Prospectus or any such amendment or supplement in reliance upon and in conformity with written information furnished to the Company by such Selling Stockholder expressly for use therein; and will reimburse each Underwriter for any legal or other expenses reasonably incurred by such Underwriter in connection with investigating or defending any such action or claim as such expenses are incurred; provided, however, that such Selling Stockholder shall not be liable in any such case to the extent that any such loss, claim, damage or liability arises out of or is based upon an untrue statement or alleged untrue statement or omission or alleged omission made in any Preliminary Prospectus, any Registration Statement or the Prospectus or any such amendment or supplement in reliance upon and in conformity with written information furnished to the Company by an Underwriter through the Representatives specifically for use therein, it being understood and agreed that the only such

information furnished by any Underwriter consists of the information described as such in subsection (c) below; provided, further that no Selling Stockholder shall be responsible, pursuant to the indemnity or contribution of this Section 7, or any breach of this Agreement, for losses, liabilities, claims, damages or expenses for an amount in excess of the gross proceeds (after deducting underwriting discounts and commissions, but before offering expenses) to such indemnifying Selling Stockholder from the sale of Offered Securities by it.

(c) Each Underwriter will severally and not jointly indemnify and hold harmless the Company, its directors and officers and each person, if any who controls the Company within the meaning of Section 15 of the Act and each Selling Stockholder, against any losses, claims, damages or liabilities to which the Company or such Selling Stockholder may become subject, under the Act or otherwise, insofar as such losses, claims, damages or liabilities (or actions in respect thereof) arise out of or are based upon any untrue statement or alleged untrue statement of any material fact contained in any Registration Statement, the Prospectus, or any amendment or supplement thereto, or any related Preliminary Prospectus, or arise out of or are based upon the omission or the alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, in each case to the extent, but only to the extent, that such untrue statement or alleged untrue statement or omission or alleged omission was made in reliance upon and in conformity with written information furnished to the Company by such Underwriter through the Representatives specifically for use therein, and will reimburse any legal or other expenses reasonably incurred by the Company and each Selling Stockholder in connection with investigating or defending any such loss, claim, damage, liability or action as such expenses are incurred, it being understood and agreed that the only such information furnished by any Underwriter consists of (i) the following information in the Prospectus furnished on behalf of each Underwriter: the concession and reallowance figures appearing in the fifth paragraph and the information appearing in paragraph twelve under the caption “Underwriting”; and (ii) the information in the Prospectus furnished on behalf of ▇▇▇▇▇▇▇, ▇▇▇▇▇ & Co., appearing in paragraphs sixteen and seventeen under the caption “Underwriting”.

(d) Promptly after receipt by an indemnified party under this Section of notice of the commencement of any action, such indemnified party will, if a claim in respect thereof is to be made against the indemnifying party under subsection (a), (b) or (c) above, notify the indemnifying party of the commencement thereof; but the omission so to notify the indemnifying party will not relieve it from any liability which it may have to any indemnified party otherwise than under subsection (a), (b) or (c) above. In case any such action is brought against any indemnified party and it notifies the indemnifying party of the commencement thereof, the indemnifying party will be entitled to participate therein and, to the extent that it may wish, jointly with any other indemnifying party similarly notified, to assume the defense thereof, with counsel satisfactory to such indemnified party (who shall not, except with the consent of the indemnified party, be counsel to the indemnifying party), and after notice from the indemnifying party to such indemnified party of its election so to assume the defense thereof, the indemnifying party will not be liable to such indemnified party under this Section, for any legal or other expenses subsequently incurred by such indemnified party in connection with the defense thereof other than reasonable costs of investigation. No indemnifying party shall, without the prior written consent of the indemnified party, effect any settlement of any pending or threatened action in respect of which any indemnified party is or could have been a party and indemnity could have been sought hereunder by such indemnified party unless such settlement (i) includes an unconditional release of such indemnified party from all liability on any claims that are the subject matter of such action and (ii) does not include a statement as to, or an admission of, fault, culpability or a failure to act by or on behalf of an indemnified party.

(e) If the indemnification provided for in this Section is unavailable or insufficient to hold harmless an indemnified party under subsection (a), (b) or (c) above, then each indemnifying party shall contribute to the amount paid or payable by such indemnified party as a result of the losses, claims, damages or liabilities referred to in subsection (a), (b) or (c) above (i) in such proportion as is appropriate to reflect the relative benefits received by the Company and the Selling Stockholders on the one hand and the Underwriters on the other from the offering of the Securities or (ii) if the allocation provided by clause (i) above is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative

benefits referred to in clause (i) above but also the relative fault of the Company and the Selling Stockholders on the one hand and the Underwriters on the other in connection with the statements or omissions which resulted in such losses, claims, damages or liabilities as well as any other relevant equitable considerations. The relative benefits received by the Company and the Selling Stockholders on the one hand and the Underwriters on the other shall be deemed to be in the same proportion as the total net proceeds from the offering (before deducting expenses) received by the Company and the Selling Stockholders bear to the total underwriting discounts and commissions received by the Underwriters. The relative fault shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact relates to information supplied by the Company, the Selling Stockholders or the Underwriters and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such untrue statement or omission. The amount paid by an indemnified party as a result of the losses, claims, damages or liabilities referred to in the first sentence of this subsection (e) shall be deemed to include any legal or other expenses reasonably incurred by such indemnified party in connection with investigating or defending any action or claim which is the subject of this subsection (e). Notwithstanding the provisions of this subsection (e), no Underwriter shall be required to contribute any amount in excess of the amount by which the total price at which the Securities underwritten by it and distributed to the public were offered to the public exceeds the amount of any damages which such Underwriter has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. The Underwriters’ obligations in this subsection (e) to contribute are several in proportion to their respective underwriting obligations and not joint.

(f) The obligations of the Company and the Selling Stockholders under this Section shall be in addition to any liability which the Company may otherwise have and shall extend, upon the same terms and conditions, to each person, if any, who controls any Underwriter within the meaning of the Act; and the obligations of the Underwriters under this Section shall be in addition to any liability which the respective Underwriters may otherwise have and shall extend, upon the same terms and conditions, to each director of the Company, to each officer of the Company who has signed a Registration Statement and to each person, if any, who controls the Company within the meaning of the Act.

8. Default of Underwriters. If any Underwriter or Underwriters default in their obligations to purchase Offered Securities hereunder on either the First or any Optional Closing Date and the aggregate number of shares of Offered Securities that such defaulting Underwriter or Underwriters agreed but failed to purchase does not exceed 10% of the total number of shares of Offered Securities that the Underwriters are obligated to purchase on such Closing Date, ▇▇▇▇▇▇▇, Sachs & Co. may make arrangements satisfactory to the Company and the Selling Stockholders for the purchase of such Offered Securities by other persons, including any of the Underwriters, but if no such arrangements are made by such Closing Date, the non-defaulting Underwriters shall be obligated severally, in proportion to their respective commitments hereunder, to purchase the Offered Securities that such defaulting Underwriters agreed but failed to purchase on such Closing Date. If any Underwriter or Underwriters so default and the aggregate number of shares of Offered Securities with respect to which such default or defaults occur exceeds 10% of the total number of shares of Offered Securities that the Underwriters are obligated to purchase on such Closing Date and arrangements satisfactory to ▇▇▇▇▇▇▇, ▇▇▇▇▇ & Co., the Company and the Selling Stockholders for the purchase of such Offered Securities by other persons are not made within 36 hours after such default, this Agreement will terminate without liability on the part of any non-defaulting Underwriter, the Company or the Selling Stockholders, except as provided in Section 9 (provided that if such default occurs with respect to Optional Securities after the First Closing Date, this Agreement will not terminate as to the Firm Securities or any Optional Securities purchased prior to such termination). As used in this Agreement, the term “Underwriter” includes any person substituted for an Underwriter under this Section. Nothing herein will relieve a defaulting Underwriter from liability for its default.

9. Survival of Certain Representations and Obligations. The respective indemnities, agreements, representations, warranties and other statements of the Company or its officers and of the

several Underwriters set forth in or made pursuant to this Agreement will remain in full force and effect, regardless of any investigation, or statement as to the results thereof, made by or on behalf of any Underwriter, any Selling Stockholder, the Company or any of their respective representatives, officers or directors or any controlling person, and will survive delivery of and payment for the Offered Securities. If this Agreement is terminated pursuant to Section 8 or if for any reason the purchase of the Offered Securities by the Underwriters is not consummated, the Company and the Selling Stockholders shall remain responsible for the expenses to be paid or reimbursed by it pursuant to Section 5 and the respective obligations of the Company, the Selling Stockholders and the Underwriters pursuant to Section 7 shall remain in effect, and if any Offered Securities have been purchased hereunder the representations and warranties in Section 2 and all obligations under Section 5 shall also remain in effect. If the purchase of the Offered Securities by the Underwriters is not consummated for any reason other than solely because of the termination of this Agreement pursuant to Section 8 or the occurrence of any event specified in clause (iii), (iv), (v), (vi) or (vii) of Section 6(c), the Company and the Selling Stockholders will, jointly and severally, reimburse the Underwriters for all out-of-pocket expenses (including fees and disbursements of counsel) reasonably incurred by them in connection with the offering of the Offered Securities.

10. Notices. All communications hereunder will be in writing and, if sent to the Underwriters, will be mailed, delivered or telegraphed and confirmed to the Representatives, c/o Goldman, Sachs & Co., ▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇ ▇▇▇▇, ▇▇▇ ▇▇▇▇ ▇▇▇▇▇, Attention: Registration Department, or, if sent to the Company, will be mailed, delivered or telegraphed and confirmed to it at ▇▇▇▇▇ ▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇▇, ▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇, Attention: ▇▇▇▇▇▇ ▇. ▇▇▇▇▇, or, if sent to the Selling Stockholders or any of them, will be mailed, delivered or telegraphed and confirmed to such Selling Stockholder’s counsel at its address set forth in Schedule A hereto; provided, however, that any notice to an Underwriter pursuant to Section 7 will be mailed, delivered or telegraphed and confirmed to such Underwriter.

11. Successors. This Agreement will inure to the benefit of and be binding upon the parties hereto and their respective personal representatives and successors and the officers and directors and controlling persons referred to in Section 7, and no other person will have any right or obligation hereunder.

12. Representation. The Representatives will act for the several Underwriters in connection with this financing, and any action under this Agreement taken by the Representatives jointly or by ▇▇▇▇▇▇▇, Sachs & Co. will be binding upon all the Underwriters. The Attorneys-in-Fact will act for their respective Selling Stockholders in connection with such transactions, and any action under or in respect of this Agreement taken by such Attorneys-in-Fact will be binding upon such Selling Stockholders.

13. Counterparts. This Agreement may be executed in any number of counterparts, each of which shall be deemed to be an original, but all such counterparts shall together constitute one and the same Agreement.

14. Applicable Law. This Agreement shall be governed by, and construed in accordance with, the laws of the State of New York, including, without limitation, Sections 5-1401 and 5-1402 of the New York General Obligations Law and New York Civil Practice Laws and Rules 327(b).

The Company and the Selling Stockholders hereby submit to the non-exclusive jurisdiction of the Federal and state courts in the Borough of Manhattan in The City of New York in any suit or proceeding arising out of or relating to this Agreement or the transactions contemplated hereby.

If the foregoing is in accordance with the Representatives’ understanding of our agreement, kindly sign and return to the Company one of the counterparts hereof, whereupon it will become a binding agreement among the Company, the Selling Stockholders and the several Underwriters in accordance with its terms.

Very truly yours, VCA ANTECH, INC.

By:		/s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇
Name: ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ Title: Chief Financial Officer

GREEN EQUITY INVESTORS III, L.P. CALIFORNIA PUBLIC EMPLOYEES’ RETIREMENT SYSTEM CAPITAL D’AMERIQUE CDPQ, INC. PROCIFIC THE NORTHWESTERN MUTUAL LIFE INSURANCE COMPANY TCW/CRESCENT MEZZANINE PARTNERS II, L.P. TCW/CRESCENT MEZZANINE TRUST II TCW LEVERAGED INCOME TRUST, L.P. TCW LEVERAGED INCOME TRUST II, L.P. TCW LEVERAGED INCOME TRUST IV, L.P. GS MEZZANINE PARTNERS II, L.P. GS MEZZANINE II OFFSHORE, L.P. ▇▇▇▇▇▇ ▇. ▇▇▇▇▇

By:		/s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇
Name: ▇▇▇▇▇ ▇. ▇▇▇▇▇▇ Title: Chief Financial Officer
		As Attorney-in-Fact acting on behalf of each of the Selling Stockholders named in Schedule A to this Agreement

Accepted as of the date hereof:

▇▇▇▇▇▇▇, SACHS & CO. CREDIT SUISSE FIRST BOSTON LLC BANC OF AMERICA SECURITIES LLC ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ INC. ▇▇▇▇▇▇▇▇▇ & COMPANY, INC. ▇▇▇▇▇ FARGO SECURITIES, LLC


By:		/s/ ▇▇▇▇▇▇▇, ▇▇▇▇▇ & CO.
		(▇▇▇▇▇▇▇, Sachs & Co.)

On behalf of each of the Underwriters

10,050,000 Shares VCA Antech, Inc. Common Stock UNDERWRITING AGREEMENT

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