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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.
1 Hookworms are a serious threat to dogs, especially young puppies. 2  They can cause blood loss, weight loss, diarrhea or death. 3  Hookworms live in your dog's digestive system. 4  They must be diagnosed by your veterinarian.