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Black tar like stool is never a good sign. This is likely melena which is digested blood.
It can often indicate that there is bleeding
somewhere in the digestive system. Often that bleeding is very high in the system like stomach
or first part of the small intestine. This allows the blood time to be digested and change to black tar like appearance before it passes in the feces.
Colonic blood and large intestinal blood is often bright red and fresh because it comes from a source closer to the anus/rectum.
Parasites are a very common cause of blood in the digestive system and weight loss. Other causes might include a disease called hemorhagic gastroenteritis, toxins, stomach uclers, foreign bodies in the digestive tract and others. Some of these can be fatal, so it is best to have your friend Baby checked by a Vet as soon as possible.
In addition, if you have given any pepto bismol in the past this can sometimes stain the feces black. If you are giving another medications these can also cause stomach bleeding.
But, the black tar is most likely blood. The cause will need to be determined by your Veterinarian. You should go as soon as possible.
Please feel free to ask any follow up questions or any other questions you might have!
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