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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.
Living mainly in the small intestine, hookworms suck the blood of their hosts. Puppies can become infected from their mothers. Adult dogs can be infected through their skin or when cleaning themselves. Infection causes weakness and malnutrition and can lead to death in puppies. Two rounds of deworming medication are usually effective, but a puppy may need other treatment, as well.