Heartgard - Plus Chewable Tablets - For Large Dogs 51-100 LBS (Brown) - 6 TABSOverview: Heartgard Plus is a heartworm preventative that kills heartworms and helps to control and treat hookworms. Given monthly, it comes in a chewable tablet that you can feed to your pal as a tasty, beef flavored treat. Head back to the dog park, reassured that your dog is protected from nasty parasites. Uses To prevent heartworm disease by eliminating the tissue stage of heartworm larvae (Dirofilaria immitis) for one month (30 days) after