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Bleeding that takes place in the esophagus, stomach, or the first part of the small intestine most often causes the stool to appear black or tarry. Your doctor may use the term melena.. Bleeding in the upper part of the GI tract will usually cause black stools due to: Abnormal blood vessels.
The most common reasons for a bloody stool are parasites or an intestinal tract problem. Dog stool blood can indicate minor problems such as constipation (when the blood is red and the stool is dry and hard) to chronic conditions such as a bleeding tumor.