The dog has a black tarry stool, which means that the appearance of the stool is black and has a bloody smell. At the same time plus the iron sulfide makes the intestinal wall inside the mucus secretion more, thus making it look very light color. The dog’s feces are asphaltic in color. Gastrointestinal bleeding causes digested blood to remain in the feces. It is usually due to bleeding from the upper gastrointestinal tract that causes black feces to appear, but it can also occur because the dog swallowed blood from bleeding in the mouth or from bleeding in the respiratory tract. Owners can see if they have recently given it a relatively sharp bone or some item that has caused its intestines to be scratched, and it may also be caused by the color of the food fed, like eating pork liver, which is caused by these foods.
