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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. These are also much more common in dogs than in cats. They are very small, thin worms that fasten to the wall of the small intestine and suck blood. Dogs get hookworms from larval migration in the uterus, from contact with the larvae in stool-contaminated soil, or from ingesting the eggs after birth.