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1 Passing black, tarry stools and Blood in stools as in case of inflammatory bowel disease (16 causes) 2  Passing black, tarry stools and Bloody stool (16 causes)  Passing black, tarry stools and Abdominal symptoms (15 causes)
Answer by Binome (1975). Tarry black stool can be a sign of blood in the digestive system, especially if his diet has been changed. You should probably take him to the vet if he's showing any other signs of ill health.add a comment. +1 vote!o, it is not. Your dog may have upper intestinal bleeding which shows black in his feces. If his stool is very hard, he may have obstipation, which is an extreme presentation of constipation requiring IV hydration and intervention to clear his intestines, as well as nutritional guidance. add a comment.