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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.
Dogs get infected with hookworms by ingesting contaminated sources that contain hookworm or roundworm larvae. Hookworm larvae pass through the dog's skin and migrate to the intestines to form adult hookworms. Pregnant pets may transmit the larvae to their unborn puppies through placental blood flow.