See a vet now
Black, tarry, sticky stool (melena) usually means bleeding in the stomach or small intestine. Pepto-Bismol, iron supplements and some foods can also darken stool.
See a vet now if you notice:
- Black, tarry stool or lots of blood
- Vomiting as well, or not eating
- Lethargy, weakness or pale gums
- A puppy, senior or dog with health problems
- Possible toxin exposure (rat bait, medicines)
Possible causes
- Stomach ulcers (including from NSAIDs or steroids)
- Swallowed blood (nosebleed, mouth injury)
- Toxins, tumors or clotting problems
- Pepto-Bismol (bismuth) or iron supplements
What to do
- Call your vet the same day, or go to an emergency vet if your dog is weak, pale or vomiting.
- Tell your vet about any medicines, including Pepto-Bismol or pain relievers.