Heartworms are spread by mosquitoes prevalent in the Wilmington, DE area. They are a potentially life-threatening danger for our dogs and also our cats! Yet, they can be safely and easily prevented. At our hospital, we carry a complete line of heartworm prevention to protect both cats and dogs. These include the very tasty oral chewable Heartgard, oral Trifexis (dogs only), and topical products, Revolution (for both cats and dogs) and Advantage Multi (cats only). Each of these FDA-approved medicines is prescribed by our veterinarians specifically for your pet and is backed by the manufacturer's assurance of safety and effectiveness. To ensure effectiveness and maintain the manufacturer's guarantee, we require blood testing of all dogs before starting heartworm prevention and annually thereafter. These tests are not required for cats but are encouraged.