The largest tapeworms can be 20 m or longer. Symptoms vary widely, depending on the species causing the infection. Large tapeworms are made almost entirely of reproductive structures with a small "head" for attachment. In a tapeworm infection, adults absorb food predigested by the host, so the worms have no need for a digestive tract or a mouth. Tapeworms live in the digestive tracts of vertebrates as adults and often in the bodies of various animals as juveniles. The eggs are ingested by the pet and the life cycle is completed when the worm grows into an adult in the intestine of a new host. These parasites shed their infective eggs in the pet's stool and contaminate the environment some eggs can live on yards or fields for years. Worms such as roundworms, whipworms, and hookworms are very common in almost all parts of the world. There are many types of parasites that are found in the GI tract of cats and dogs.
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