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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.
Roundworms are a member of the nemathelminths phylum or group of animals. The hookworm, pinworm and trichinella are part of this group. They are more advanced than flatworms but less advanced than earthworms. They have thin round bodies, with none of the pieces or segments that earthworms have in their bodies.