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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1323974	Mwi Veterinary Supply Inc.	MWIV	Wholesale-Medical, Dental & Hospital Equipment & Supplies (5047)	020620757

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1334076	S James Hay	3041 W. Pasadena Dr. Boise ID 83705	Chief Information Officer	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock, Par Value $0.01 Per Share	Acquisiton	2011-05-02	1,500	$0.18	4,206	No	4	M	Direct
Common Stock, Par Value $0.01 Per Share	Disposition	2011-05-02	1,500	$82.86	2,706	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock, Par Value $0.01 Per Share	Employee Stock Option (right to buy)	Disposition	2011-05-02	1,500	$0.00	1,500	$0.18

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0	2008-09-30	2012-06-18	No	4	M	Direct

Footnotes

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 18, 2010.
The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $82.3845 to $83.17, inclusive. Mr. Hay has provided to MWI Veterinary Supply, Inc. (the "Company") and undertakes to provide to any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.