exhibit23.htm

We consent to the incorporation by reference in Registration Statement No. 333-127879, 333-127880, and 333-149275 on Form S-8 and Registration Statement No. 333-141078 on Form S-3 of our reports dated November 28, 2011, relating to the consolidated financial statements and consolidated financial statement schedule of MWI Veterinary Supply, Inc. and subsidiaries and the effectiveness of MWI Veterinary Supply, Inc. and subsidiaries' internal control over financial reporting, appearing in this Annual Report on Form 10-K of MWI Veterinary Supply, Inc. for the year ended September 30, 2011.