The partially digested blood turns the stools to black and tarry. No, I am not suggesting that your dog has turned into Dracula! Rather, your dog might have licked a bloody wound or he might have had a mouth injury causing him to swallow blood. Heat stroke, stress, and a type of mast cell cancer in the skin.Ĭertain metabolic diseases, such as kidney and liver failure,Īddison's disease can cause bleeding into the intestinal tract, resulting in black tarry stools.īlack tarry stools may also result from the dog ingesting some blood. Ulcers may also occur following acute stomach bloating, Ulcers in dogs may be caused by medications such as NSAIDs, corticosteroid, aspirin, etc. If your dog is passing black tarry stools, these may be the causes: Stomach Ulcersĭogs with stomach ulcers usually pass black, tarry stools. Hematochezia may indicate more serious conditions such as polyps in the colon or rectum, or colon cancer. Sometimes black, tarry stools (melena) can also be seen. Look for other symptoms such as vomiting, not eating, and listlessness. It usually causes a very sudden onset of diarrhea with fresh blood in it. HGE is a disease in dogs whose cause is unknown. Usually the dog will also vomit, have stomach cramps, and diarrhea. Look for other accompanying symptoms such as abdominal distention, diarrhea, and vomiting.Įating too much, eating spoilt foods or food intolerance and food allergies can sometimes cause bloody stools in puppies and dogs. Coli, and viral infections such as parvovirus and corona virus can also cause puppies and dogs passing bright red bloody stool.Ĭolitis) can cause dogs to pass bloody stools. Get to the vet for further treatment.Īnother common cause of bright red bloody stools in dogs is intestinal worms such as whipworms and roundworms, and intestinal parasites such as Coccidia and giardia.īacterial infections such as Salmonella, E. If it is from an injury in the anal area, try to stop the bleeding and disinfect the area. When you see bright red blood in your dog stool, therefore, first check the anal area to find out where the blood is coming from. In all these cases, the blood in the dog's stool does not come from the inside of the dog's body. These are infected lesions caused possibly by inflammation of the sweat and sebaceous glands in and around the anus. German Shepherds) are prone to a condition called perianal fistulas. It may also be due to a ruptured anal sac abscess.ĭogs with tails that set low and carried close to the body (e.g. getting bitten in the hindquarters during a dog fight). Possible causes of bright red blood in a dog's stool include: Injuries or Trauma to the AnusĪ common cause of dog having bright red bloody stool is due to some kind of injury or trauma to the anus or the anal area (e.g. Below are some common causes of hematochezia and melena. There are numerous possible causes of dog bloody stools - some are more serious than others. In the case of melena, the blood causes the stools to turn black and tarry, indicating that the source of bleeding is in the stomach or upper small intestine, and the blood has been partially digested. The red color indicates that the blood comes from the lower intestines, most likely from the colon and the rectum. In the case of hematochezia, the blood in the dog stools is bright red and is usually mixed in with the stools. ( FTC Disclosure: If you make a purchase via a link on this page, I may receive a small commission, at no added cost to you.)ĭog blood in stool can be medically categorized as either hematochezia or melena.
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