& External Parasites
Internal parasites include heartworms, roundworms, hookworms, tapeworms, and whipworms. These pests only live inside your pet, with most living in the intestine. Heartworms, however, will find their way to the heart and lungs and gather in the major arteries around those organs.
External parasites are naturally the opposite, feeding and propagating on the surface of the skin. Parasites that fall into this category include fleas, ticks, and mites.