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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.
If you suspect that your dog has worms, but they aren't visible to the naked eye, there may be other symptoms to look for. Hookworms are microscopic and also live in the intestines. This type of worm feeds on the dog's blood and has sharp teeth which can cause bleeding.