Melena in Cats
  
Melena, the term used to describe a black, tarry appearing feces, is typically seen due to bleeding in the upper portion of the gastrointestinal tract. It is also been seen in cats after they have ingested a sufficient amount of blood from the oral cavity or respiratory tract.
 
Melena is not a disease in itself but a symptom of some other underlying disease. The dark color of the blood is due to the oxidation of iron in the hemoglobin (the oxygen carrying pigment of red blood cells) as it passes through the small intestine and colon.
 
Melena tends ...read more