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Parasite profile. Hookworms are dangerous parasites that live in a dog's small intestine. With remarkable efficiency, hookworms graze on the lining of the intestine, leaving multiple bloody holes in their wake. These can lead to anemia and may even cause a small puppy to bleed to death.
The hookworm is a parasitic nematode worm that lives in the small intestine of its host-eg, dog, cat or human. Two species of hookworms commonly infect humans, Ancylostoma duodenale and Necator americanus. Some A. duodenale larvae, following penetration of the host skin, can become dormant in the intestine or muscle. 2  Infection by A. duodenale can probably also occur by the oral route, but N. americanus requires a transpulmonary migration phase.