What do Heartworms Look Like?

Heartworms live in the hearts of animals such as your dog, cat,and ferret. It looks like a piece of spaghetti and can range from 6 to 14 inches long. Since heartworms can kill an animal, it is best to give a once a month chewable treat like those made by Heartgard, Interceptor, and Program. It’s much cheaper to prevent the disease than to treat it.