Dogs pooping blood is a serious condition. Dog owners should take their pets to their vet if this occurs, or at least call them. Typically, parasites of some type are the cause. Other causes are stress, change of diet, swallowing a sharp instrument, or serious digestive problems. Regardless, it is considered a health risk for your dog.

Any change in dog stools that causes blood to develop from inside the anus and rectum is a red flag. It always involves color, consistency, and the frequency of the dog’s stools If the feces is dark, black or tar-like, it is a matter of concern there is blood in the dog stools. This should be a double flag requiring a quick call to your vet.


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Dogs pooping blood in any color of feces other than brown means there can be digested blood located somewhere in the dog’s gastrointestinal tract.  Repeating myself,  bloody feces in dogs can be caused by bleeding ulcers, foreign objects, colitis or anal gland conditions. This is something that cannot be stressed enough.

Dog owners spend over half their lives knee-deep in dog poop for one reason or another. We become so conditioned to it that its a normal part of /our life, especially if we run a shelter, a large kennel, or a foster home for unwanted pets.

When dogs poop blood, I generally look for dog worms at the get-go, especially if the dog is new.  I routinely worm my own dogs, but if I find blood in dog poop at my place, parasites or dog worms are never ruled out as there are so many types of dog worms and parasites. The affected dog is taken to the vet for a fecal sample right away.

Dog worms that are most apt to cause the condition of dogs pooping blood are hookworms and whipworms. Whipworms are accompanied by bleeding rectums, slimy bloody stools, and anemia.  Hookworms, on the other hand, cause bleeding stools and anemia, not slimy stools or bleeding rectums.

Health risks for dogs pooping blood

  • Black stools – sometimes black stools are caused by the dog or puppy consuming Ibuprofen or Motrin, causing a serious toxicity (poisoning). This is accompanied by pale gums, large amounts of digested blood, and a low red blood cell count.
  • Coccidia – this is an intestinal disease that primarily affects puppies, kittens, canaries and human beings. A parasite that lives in the wall of the intestines, it causes a water, mucous–based diarrhea. In puppies, it can be fatal if not treated. Without treatment, it damages the lining of the intestinal tract.
  • Dyschezia – constipation associated with a defective reflex for defecation in dogs and young children.
  • Dog diarrhea – loose feces, dog diarrhea is the most common problem that affects dogs. If it is accompanied by loss of appetite, marked lethargy, frequent vomiting, abdominal pain, and lasts longer than 48 hours … medical attention is required.
  • Hematochezia – the passage of bloody stools, Hematochezia involves a passage of fresh blood through the dog’s colon or rectum. It is more commonly referred to “bright red blood in the stool.” As it can also be maroon in color, the blood is usually in or with the feces, located in the lower gastrointestinal tract.
  • Melena  – the black, “tarry” dog feces that is associated with upper gastrointestinal bleeding. The black color comes from hemoglobin in the blood, changed by digestive chemicals and intestinal bacteria.
  • Mucus in dog stools –  this can be caused by a variety of dog illnesses and parasites, even though it is not always an indicator of poor dog health. If it is accompanied by blood or a serious change in your dog’s bowel movements, it is usually more serious.
  • Blood in dog stools – Dyschezia and Hematochezia


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