Cats with adult heartworms typically have just one to three worms, and many cats In the early stages of the disease, many dogs show few symptoms or no.
Dirofilaria immitis is a species of parasitic worm better known by pet owners as heartworms. Heartworm larvae can grow into adult worms in.
Heartworm Disease – What Is It and What Causes It? In an infected dog, adult female heartworms release their offspring, called microfilariae.