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Dogs would normally have mucus in the stool. This clear or white slimy substance has the important role of lubricating the lining of the intestines for easy passage of feces from the intestines and out to the anus. Excessive mucus in the dogâs stool though can be an indication of a health concern.
Melena, in dogs, is the presence of digested blood in the feces and makes the stools appear black and tarry. Melena is different from fresh blood in the stool (hematochezia).Melena may represent a severe, life-threatening illness, and should not be ignored. It must especially be addressed if it persists or worsens.elena develops when bleeding occurs into the stomach or small intestines. The bleeding must be high in the intestinal tract in order for the blood to be digested and become discolored. Bleeding into the colon or rectum (hematochezia) appears as fresh blood in the stool.