Heartworms are parasites that live in an animal’s heart and adjoining blood vessels, where they interfere with normal blood flow. They are thin, white and between 6-14 inches long at maturity.
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Heartworm Dog

Heartworms are parasites that live in an animal’s heart. They are transmitted to cats when an infected mosquito injects heartworm larvae which penetrate through tissue, eventually reaching the heart. There it grows to maturity and reproduces.
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Heartworm Cat

Tapeworms are intestinal parasites found in dogs and cats. They are flat and segmented, and the segments may break off and be seen in the stool of pets.
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Tapeworms

Roundworms are the most common parasite of the digestive tract in dogs and cats. Many puppies are born with roundworms. An infestation can cause a variety of symptoms, which are usually more severe in younger animals.
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Roundworms

Coccidia are single celled organisms that infect the intestine. They are microscopic parasites detectable on routine fecal tests in the same way that worms are but coccidia are not worms and they are not visible to the naked eye. Coccidia infection causes a watery diarrhea, which is sometimes bloody and can even be a life-threatening problem to an especially young or small pet.
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Coccidia

Whipworms are worms that infect the intestine. The canine whipworm is a common parasite and is a cause of diarrhea in dogs. The feline whipworms are uncommon and usually do not produce any symptoms.
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Whipworms

Hookworms are a common intestinal parasite of dogs and cats. An infestation can cause severe disease, especially in young or weakened animals.
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Hookworms