Interceptor flavor tabs are indicated for use in the prevention of heartworm disease caused by Dirofilaria Immitis, the control of adult hookworms, and the removal and control of adult roundworms and whipworm infections in dogs, puppies four weeks of age or greater and two pounds body weight or greater, as well as cats. See the GoodRx for Pets Heartworm Comparison chart to find which heartworm prevention is best for your pet.