Exhibit 99.1

2 Introduction Mary Pat Thompson Senior Vice President and Chief Financial Officer Ryan Cleverley Manager of Financial Reporting and Investor Relations

3 Disclaimer/Forward-Looking Statements This presentation may contain forward-looking statements based on current management expectations. Numerous factors, including those related to market conditions may cause results to differ materially from those anticipated in forward-looking statements. Many of the factors that will determine the Company’s future results are beyond the ability of the Company to control or predict. These statements are subject to risks and uncertainties and, therefore, actual results may differ materially. Potential investors should not place undue reliance on forward-looking statements, which reflect management’s views only as of the date hereof. The Company undertakes no obligation to revise or update any forward-looking statements, or to make any other forward-looking statements, whether as a result of new information, future events or otherwise.

5 Mission Statement MWI will be the best resource to the veterinary profession by delivering superior value, efficiency and innovation.

6 Investment Highlights • Favorable industry dynamics driving demand for animal health products • Market leading position with national footprint and expansion opportunities • Broad product portfolio and value-added services • Longstanding relationships with diversified customer and vendor bases • Premier sales and marketing franchise • Strong and consistent financial performance driven by organic growth • Experienced management team

7 Our Company • Leading distributor of animal health products to veterinarians across U.S. • 30 years of operating history • Over 16,000 veterinary clinics nationwide • Over 11,000 products sourced from more than 450 vendors • Strong and consistent financial performance

8 Recent Developments • Successfully negotiated vendor contracts with two of our largest vendors which include more favorable terms than our prior contracts with these vendors • Opened a 105,000 square-foot distribution center in the Kansas City area in October 2007 • Fiscal year 2006 through March 2008: MWI increased capacity by successfully opening, moving or expanding 7 distribution centers • Continued expansion of value-added services, including e-commerce, inventory management, pharmacy fulfillment and capital equipment consultation

10 4.5 4.7 5.0 5.3 5.8 2002 2003 2004 2005 2006 Companion Animal ~53% Production Animal ~47% Attractive Industry Dynamics • Large, fragmented U.S. market with favorable growth characteristics - 58,000 practicing veterinarians - 27,000 veterinary clinics - 450 vendors • Diversified customer and vendor bases - Distributors play vital role • Frequent, small orders - Clinics avoid storing and managing inventory • Importance of sales representatives - Long-term relationships - Product information / consultation • No third party reimbursement risk U.S. Animal Health Product Sales 2006 U.S. Animal Health Product Sales By Segment $5.8 Billion Source: Animal Health Institute, American Veterinary Medical Association, and Company estimates ($ in billions) CAGR ~ 6.5 %

11 • Consists of approximately: - 90 million cats - 75 million dogs - 7 million horses - Other pets • Increased spending driven by: - Human-animal bond - Rising numbers of households with pets - Focus on animal health / preventative care - Technology migration from human health to veterinary medicine - Aging pet population Companion Animal Market Large market with attractive growth profile Note: Number of cats, dogs, and horses are for the U.S. only. Source: Dogs and Cats - APPMA 2007-2008 National Pet Owner’s Survey . Horses for 2004 – US Equine Market, Brakke Consulting.

12 • Includes cattle, swine, poultry, and other food-producing animals - 97 million cattle - 65 million swine • Spending driven by: - Economic decisions - Improved productivity / yield - Disease prevention Production Animal Market Significant market with volume driven by large order sales Source: USDA Agriculture statistics

13 Importance of Distributors Customers Vendors • Single source for multiple products • Timely product delivery • Reduced number of vendors • Inventory management • Product information • Consultation • Cost-effective access to a fragmented market • Logistics and distribution • Sales and marketing support • Ability to move market share • Flexible selling models Distributors

14 Competitive Landscape Key Competitors(1) • Competitive market • Competition from both numerous vendors and distributors • Competing factors include: - Customer relationships - Service and delivery - Product selection - Price - e-business capabilities • Industry consolidation well under way (1) Excludes vendors and other national, regional, local and specialty distributors.

16 The MWI Edge: Leading National Distributor • Decentralized distribution network facilitates regional market responsiveness - 13 strategically located distribution centers throughout the U.S. - 5 pharmacies distributing Rx products to end-users nationwide Same day shipment on 98% of orders placed

17 The MWI Edge: Broad Product Portfolio • Over 11,000 products stocked in MWI warehouses • Over 7,000 additional products available by special order • Continually evaluate product portfolio to improve offerings • Key products include: Pharmaceuticals, Vaccines and Parasiticides Diagnostics, Capital Equipment and Supplies Veterinary Pet Food and Nutritional Products

18 The MWI Edge: 2007 Product Revenue Mix 40% 19% 7% 8% 3% 23% Pharmaceuticals Vaccines Parasiticides Diagnostics Capital Equipment Other Supplies

19 The MWI Edge: Expansive Vendor Network • Sources products from over 450 vendors • Provides cost-effective access to large and diverse customer base • Serves as a principal distributor for key vendors • Length of relationship with many key vendors over 10 years MWI’s size and reach have become increasingly important to its vendor base

20 Flexible Selling Arrangements – Agency Relationships • Do not purchase and take inventory of products • Upon receipt of order, transmit order to vendor, who picks, packs and ships order • Receive commission payment for soliciting order • Agency relationships with several leading animal health product vendors • Gross billings of $194.4 million, generating commission revenue of $9.6 million in FY 2007

21 The MWI Edge: Strong Customer Relationships • Nation’s largest private veterinary practice • Customer for over 11 years • Highly efficient ordering process Feeders’ Advantage • Buying group of several of the largest cattle feeders in U.S. • Customer for over 11 years • Highly efficient ordering process Corporate Clients Independent Veterinary Practices • Often small, privately-held • Place at least one order / week • Independent veterinary practices and producers account for >80% of our product sales • Loyal customer base: • Over 52% of sales from accounts over 5 years old • Over 66% of sales from accounts over 3 years old

22 69 75 79 93 106 117 130 82 94 111 134 155 163 173 2002 2003 2004 2005 2006 2007 Q208 Telesales Reps Field Sales Reps The MWI Edge: Premier Sales and Marketing Franchise Sales Representatives FYE Sept 30, • Dual coverage approach with frequent contact • Act as business consultants • Continuous training initiatives • Performance driven compensation • Significant industry experience Direct Marketing • Over 600,000 pieces of direct marketing material distributed • Comprehensive and specialty catalogs, loyalty programs, product / vendor programs, flyers, order stuffers 280 261 227 190 169 151 303

23 The MWI Edge: Value-Added Services E-Commerce Platform • Technology systems closely integrated with customers’ day-to-day operations E-Commerce Product Sales as a Percent of Total Sales 2004 2005 2006 2007 2Q08 18% 21% 23% 24% 27%

24 The MWI Edge: Value-Added Services Value-added services increase loyalty of customer base • E-commerce platform • Pharmacy fulfillment and launched Proxy Rx • SWEEP™ Inventory management system • Equipment procurement consultation • Special order fulfillment • Educational seminars • Pet cremation

25 MWI Growth Strategy Expand Number of Veterinarians Served Offer Innovative, Differentiated Solutions to Veterinarians Increase Share of Spend from Existing Customers Pursue Strategic Acquisitions Expand Agreements with Existing and New Vendors Increase Overall Productivity and Profitability

27 $195.6 $221.4 $341.7 $394.3 $496.7 $606.2 $710.1 $336.1 $398.3 $281.2 $0.0 $100.0 $200.0 $300.0 $400.0 $500.0 $600.0 $700.0 $800.0 2000 2001 2002 2003 2004 2005 2006 2007 2Q07 2Q08 Strong Growth in Revenues Total Revenues ($ in millions) FY 00-07 CAGR 20.2 % FYE Sept 30, + 1 8.5%

28 Strong Growth in Operating Income 0 5 10 15 20 25 30 2000 2001 2002 2003 2004 2005 2006 2007 2Q07 2Q08 Operating Income Depreciation & Amortization Management Fee Operating Income ($ in millions) * includes the effect of rebate earnings of approximately $2.5 million (pre-tax) earned in fiscal year 2006 that historically would have been earned in our fiscal year 2007 first quarter ended December 31, 2006. ** rebates were approximately $1.0 million less than anticipated in the first fiscal quarter of 2008 due to a difference with a key vendor over the amount of rebates dollars that were expected. We received approximately $400,000 of this rebate during the second fiscal quarter of 2008 and expect to receive the remaining portion during the balance of fiscal year 2008. ($ in millions) 2000 2001 2002 2003 2004 2005 2006 2007 2Q07 2Q08 Management Fee - - 0.1 $ 0.3 $ 0.4 $ 2.5 $ - $ - $ - $ - $ Depreciation & Amortization 0.8 0.8 0.9 1.0 1.1 1.5 2.0 2.4 1.2 1.5 Operating Income 6.4 7.3 7.2 10.2 12.6 15.8 23.7 * 26.7 13.5 14.8 ** FYE Sept 30,

29 Condensed Consolidated Balance Sheets ($ in thousands) 0 0 249 Other long-term liabilities $ 230,559 $ 267,194 $ 283,634 Total Liabilities & Stockholders' Equity 129,626 160,011 169,580 Stockholders' Equity 292 195 97 Long-term debt 505 474 466 Deferred income taxes 100,136 106,514 113,242 Total Current Liabilities 7,016 7,790 7,557 Accrued expenses & other current liabilities 82,561 98,724 105,685 Accounts payable $ 10,559 $ 0 $ 0 Line-of-credit Liabilities $ 230,559 $ 267,194 $ 283,634 Total Assets 187,791 217,778 230,386 Total Current Assets 3,153 2,880 2,971 Other current assets 85,083 94,623 107,656 Inventories 99,518 111,676 118,363 Receivables, net $ 37 $ 8,599 $ 1,396 Cash 9/30/2006 9/30/2007 3/31/2008 Assets

30 Financial Highlights • Second Quarter Fiscal 2008 Highlights • Revenues were up 11.4% to $195.0 million for the quarter ended March 31, 2008 and 18.5% to $398.3 for the six months ended March 31, 2008 compared to the same periods last year • Net income was up 18.7% to $4.4 million, or $0.36 per diluted share compared to $3.7 million, or $0.31 per diluted share, last year • Pharmacy sales grew by 22% and internet sales to independent veterinary practices grew by 41% compared to the same period last year. Our product sales from the internet as a percentage of sales improved to 27% for the quarter compared to 23% for the same period last year

31 Financial Highlights • Consistent organic growth • Stable, recurring revenue baseover 95% consumables • Minimal capital expenditure requirements • Strong returns on net assets and invested capital • Flexible and strong balance sheet

33 Investment Highlights • Favorable industry dynamics driving demand for animal health products • Market leading position with national footprint and expansion opportunities • Broad product portfolio and value-added services • Longstanding relationships with diversified customer and vendor bases • Premier sales and marketing franchise • Strong and consistent financial performance driven by organic growth • Experienced management team