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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt; FONT-WEIGHT: bold">CURRENT REPORT</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt; FONT-WEIGHT: bold">Date of Report (Date of earliest event reported):&#160; November 18, 2010</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 18pt; FONT-WEIGHT: bold"><a name="fis_unidentified_table"><!--EFPlaceholder--></a>MWI VETERINARY SUPPLY, INC.</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">(Exact name of registrant as specified in its charter)</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">(I.R.S. Employer</font></div>

<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Identification No.)</font></div>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt; FONT-WEIGHT: bold">651 S. Stratford Drive, Suite&#160;100, Meridian, ID&#160;&#160; 83642</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">Check the appropriate box below if the Form&#160;8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt; FONT-WEIGHT: bold"><a name="fis_results_of_operations"><!--EFPlaceholder--></a>Item 8.01.&#160; Other Events</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">Mary Patricia B. Thompson, Senior Vice President of Finance and Administration, Chief Financial Officer, James S. Hay, Vice President and Chief Information Officer, and John R. Ryan, Vice President of Marketing (collectively the &#8220;Executives&#8221;) have entered into pre-arranged stock trading plans to sell a limited number of their shares of MWI Veterinary Supply, Inc. (the &#8220;Company&#8221;) common stock for personal financial management purposes.&#160;&#160;These plans are designed to comply with Rule 10b5-1 of the Securities Exchange Act of 1934, as amended, and the Company&#8217;s insider trading policies regarding stock transactions (the &#8220;10b5-1 Plans&#8221;), and in accordance with Rule 10b5-1 may be amended or terminated at any time.</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">The 10b5-1 Plans entered into by Ms. Thompson, Mr. Hay and Mr. Ryan allow for the sale of a maximum of 9,439, 18,000 and 9,439 shares, respectively, of the Company&#8217;s common stock through November 30, 2011.&#160;&#160;The shares to be sold pursuant to these 10b5-1 Plans relate to stock options the Company granted to the Executives on June 18, 2002.</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">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, thereunto duly authorized.</font></div>

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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Date:&#160; November 23, 2010</font></div>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Mary Patricia B. Thompson</font></div>
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<div style="TEXT-INDENT: -18pt; DISPLAY: block; MARGIN-LEFT: 18pt; MARGIN-RIGHT: 0pt" align="left"><font style="FONT-STYLE: italic; DISPLAY: inline; FONT-FAMILY: times new roman; FONT-SIZE: 10pt">Senior Vice President of Finance and Administration, Chief&#160;&#160;Financial Officer</font></div>
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form8k.htm
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, DC 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):  November 18, 2010
MWI VETERINARY SUPPLY, INC.
(Exact name of registrant as specified in its charter)
Delaware
000-51468
02-0620757
(State or other jurisdiction of
Incorporation)
(Commission File
Number)
(I.R.S. Employer
Identification No.)
651 S. Stratford Drive, Suite 100, Meridian, ID   83642
(Address of principal executive offices)   (Zip Code)
(208) 955-8930
(Registrant's telephone number, including area code)
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:
q
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
q
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
q
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
q
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Item 8.01.  Other Events
Mary Patricia B. Thompson, Senior Vice President of Finance and Administration, Chief Financial Officer, James S. Hay, Vice President and Chief Information Officer, and John R. Ryan, Vice President of Marketing (collectively the "Executives") have entered into pre-arranged stock trading plans to sell a limited number of their shares of MWI Veterinary Supply, Inc. (the "Company") common stock for personal financial management purposes.  These plans are designed to comply with Rule 10b5-1 of the Securities Exchange Act of 1934, as amended, and the Company's insider trading policies regarding stock transactions (the "10b5-1 Plans"), and in accordance with Rule 10b5-1 may be amended or terminated at any time.
The 10b5-1 Plans entered into by Ms. Thompson, Mr. Hay and Mr. Ryan allow for the sale of a maximum of 9,439, 18,000 and 9,439 shares, respectively, of the Company's common stock through November 30, 2011.  The shares to be sold pursuant to these 10b5-1 Plans relate to stock options the Company granted to the Executives on June 18, 2002.
Transactions made under the 10b5-1 Plans will be disclosed publicly through Form 4 filings with the Securities and Exchange Commission.
SIGNATURE
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, thereunto duly authorized.
MWI VETERINARY SUPPLY, INC.
Date:  November 23, 2010
By:
/s/ Mary Patricia B. Thompson
Mary Patricia B. Thompson
Senior Vice President of Finance and Administration, Chief  Financial Officer