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Symptoms of Hookworms in Dogs. A dog with the parasite looks unhealthy and has a poor appetite; the linings of its nostrils, lips, and ears will be pale. If hookworm larvae get into the lungs, the dog will cough, as well as present several other symptoms, including dark and tarry stool, diarrhea, and constipation.
Hookworms. Common across the U.S. and Canada, hookworms are more common in dogs than in cats, with an estimated 19 percent of dogs being infected. With hook-like mouths and well-developed cutting mouthparts, these are not friendly worms. Adults reside in the small intestine, attached to the intestine walls where they feed on blood.