UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): March 8, 2017

VCA Inc.

(Exact name of registrant as specified in its charter)

12401 West Olympic Boulevard

Los Angeles, California 90064

(Address of principal executive offices) (Zip Code)

Registrant’s telephone number, including area code: 310-571-6500

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

As previously reported, on January 7, 2017, VCA Inc., a Delaware corporation (the “Company”), entered into an Agreement and Plan of Merger (the “Merger Agreement”) with MMI Holdings, Inc., a Delaware corporation (“Acquiror”), Venice Merger Sub Inc., a Delaware corporation and wholly owned subsidiary of Acquiror (“Venice Merger Sub”), and, solely for purposes of Section 9.15 of the Merger Agreement, Mars, Incorporated, a Delaware corporation (“Mars”), providing for the merger of Venice Merger Sub with and into the Company, with the Company continuing as the surviving corporation and a wholly owned subsidiary of Acquiror (the “Merger”). Under the terms of the Merger Agreement, the Merger cannot be completed until the applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended (the “HSR Act”), has expired or been terminated and the other closing conditions under the Merger Agreement have been satisfied or waived.

On February 6, 2017, the Company and Mars filed their respective notification and report forms with the Antitrust Division of the U.S. Department of Justice (“Antitrust Division”) and the Federal Trade Commission (the “FTC”), which commenced a 30-day waiting period under the HSR Act that was scheduled to expire on March 8, 2017.

Mars voluntarily withdrew its initial notification and report form on March 8, 2017, and re-filed the same on March 10, 2017. The withdrawal and re-filing are procedural steps that provide the FTC with additional time to complete its review of the Merger. The re-filing restarted the 30-day waiting period under the HSR Act. As a result, the waiting period will now expire on April 10, 2017, unless extended by a request for further information or terminated earlier.

Forward-Looking Statements

This report contains forward-looking statements within the meaning of the securities laws with respect to the proposed transaction between the Company, Mars and certain subsidiaries of Mars. The Company has included herein statements that constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. The Company generally identifies forward-looking statements in this report using words like “believe,” “intend,” “expect,” “estimate,” “may,” “plan,” “should,” “could,” “forecast,” “looking ahead,” “possible,” “will,” “project,” “contemplate,” “anticipate,” “predict,” “potential,” “continue,” or similar expressions. You may find some of these statements below and elsewhere in this report. These forward-looking statements are not historical facts and are inherently uncertain and outside of the Company’s control. Any or all of the Company’s forward-looking statements in this report may turn out to be incorrect. They can be affected by inaccurate assumptions the Company might make, or by known or unknown risks and uncertainties. Many factors mentioned in the Company’s discussion in this report will be important in determining future results. Consequently, no forward-looking statement can be guaranteed. Actual future results may vary materially. Many factors could cause actual future events to differ materially from the forward-looking statements in this report, including but not limited to: (i) the risk that the proposed transaction may not be completed in a timely manner or at all, which may adversely affect the Company’s business and the price of the common stock of the Company; (ii) the failure to satisfy or obtain waivers of the conditions to the consummation of the proposed transaction, including the adoption of the Merger Agreement by the stockholders of the Company and the receipt of certain governmental and regulatory approvals; (iii) the occurrence of any event, change or other circumstances that could give rise to the termination of the Merger Agreement; (iv) the effect of the announcement or pendency of the proposed

transaction on the Company’s business relationships, operating results and business generally; (v) risks that the proposed transaction disrupts current plans and operations of the Company, including the risk of adverse reactions or changes to business relationships with customers, suppliers and other business partners of the Company; (vi) potential difficulties in the hiring or retention of employees of the Company as a result of the proposed transaction; (vii) risks related to diverting management’s attention from the Company’s ongoing business operations; (viii) potential litigation relating to the Merger Agreement or the proposed transaction; (ix) unexpected costs, charges or expenses resulting from the proposed transaction; (x) competitive responses to the proposed transaction; and (xi) legislative, regulatory and economic developments. The foregoing list of factors is not exclusive. Additional risks and uncertainties that could affect the Company’s financial and operating results are included under the captions “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and elsewhere in the Company’s most recent Annual Report on Form 10-K for the year ended December 31, 2016, filed with the Securities and Exchange Commission (the “SEC”) on February 28, 2017, and the Company’s more recent reports filed with the SEC. The Company can give no assurance that the conditions to the proposed transaction will be satisfied, or that it will close within the anticipated time period. Investors and security holders are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date on which statements were made. Except as required by applicable law, the Company undertakes no obligation to revise or update any forward-looking statement, or to make any other forward-looking statements, whether as a result of new information, future events or otherwise.

Additional Information and Where to Find It

This report is being made in respect of the proposed transaction between the Company, Mars and certain subsidiaries of Mars. In connection with the proposed transaction, on February 15, 2017, the Company filed with the SEC and mailed (or otherwise provided) to each stockholder entitled to vote at the special meeting relating to the proposed transaction a definitive proxy statement on Schedule 14A and a form of proxy. INVESTORS AND SECURITY HOLDERS OF THE COMPANY ARE URGED TO CAREFULLY READ THESE MATERIALS (INCLUDING ANY AMENDMENTS OR SUPPLEMENTS THERETO) IN THEIR ENTIRETY AND ANY OTHER RELEVANT DOCUMENTS IN CONNECTION WITH THE PROPOSED TRANSACTION THAT THE COMPANY WILL FILE WITH THE SEC WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT THE COMPANY AND THE PROPOSED TRANSACTION. The definitive proxy statement, the preliminary proxy statement and any other materials or documents filed by the Company with the SEC, may be obtained free of charge at the SEC’s website (http://www.sec.gov) or through the investor relations section of the Company’s website (http://investor.vca.com).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: March 13, 2017