Cat parasites are common, but depending on the type, they can be mildly unpleasant to nearly fatal for a cat. There are several different types of cat parasites including the half-inch-long hookworm, the tapeworm, the roundworm, the whipworm, and heartworm. If left untreated, cat parasites can multiply, causing damage to the cat's intestines or heart. Hookworm, tapeworm, roundworm, and whipworm live in the cat's intestines and heartworm lives in the cat's heart and in the blood vessels that lead from the heart to the lungs. If caught early, cat parasites can be treated fairly easily. Your vet can prescribe a number of different antibiotics to kill cat parasites and certain diets can also help control cat parasites. Continue reading to learn more about the different types of cat parasites, symptoms, and to discover some of the most effective treatment options.