Heartworm disease is a serious disease transmitted by infected mosquitoes and, if left untreated can be fatal. Heartworm prevention is administered once a month either by pill or by topical application. Depending on the specific product you and your veterinarian choose for your pet, heartworm prevention medication can prevent other parasite infestations including internal parasites (worms) and external parasites (fleas and ticks). Cats can get heartworm, too. We recommend cats taking heartworm prevention, and we will discuss your available options during cat’s feline wellness exam. In accordance with the guidelines of the American Heartworm Society, we recommend all dogs and cats be given year round (12 months) heartworm prevention regardless of lifestyle.