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How to diagnose hookworms in dogs
Be on the lookout for diarrhea or vomiting.
A hookworm bites into the bowel wall, which can cause pain and stomach cramps. The dog is also likely to have diarrhea that is tinged with blood.
Also, if there is bleeding into the bowel, by the time the blood have passed along the gut it gives the feces a dark color. Some dogs may also vomit from hookworms, and this could contain blood as well.