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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.
Threadworms, also known as pinworms, are tiny parasitic worms that infect the large intestine of humans. Threadworms are a common type of worm infection in the UK, particularly in children under the age of 10. The worms are white and look like small pieces of thread.You may notice them around your child's bottom or in their poo.hreadworms lay their eggs around an infected person's anus (bottom), usually at night. Along with the eggs, the worm also secretes a mucus that causes itching. If the eggs get stuck on the person's fingertips when they scratch, they can be transferred to their mouth or on to surfaces and clothes.