Black, shiny, sticky, tar-like stool can represent melena, which is digested blood that has passed through the gastrointestinal tract. True melena is different from ordinary dark-brown stool.
The Safest Next Step
If your cat’s stool is genuinely black, tarry, sticky, and unusually foul-smelling, contact a veterinarian promptly. Urgent care is especially important when black stool occurs with pale gums, weakness, vomiting, collapse, rapid breathing, or reduced appetite.
Why Blood Can Turn Black
Blood originating higher in the digestive tract can be digested before it leaves the body, turning the stool black rather than bright red. This is why melena can be a sign of internal gastrointestinal bleeding.
Possible Causes
- Stomach or intestinal ulceration
- Severe gastrointestinal inflammation
- Foreign material or trauma
- Clotting disorders or toxin exposure
- Swallowed blood from the mouth or nose
- Certain medications that irritate the gastrointestinal tract
Dark Brown vs. Tarry Black
Normal stool can vary in shade. Melena is typically not just dark; it is often jet-black, sticky, shiny, and difficult to wipe away. Take a clear photo and, if practical, bring a fresh sample to the veterinary clinic.
Signs of Blood Loss
| Finding | Why it matters |
|---|---|
| Pale or white gums | Anemia or significant blood loss is possible |
| Weakness or collapse | Emergency concern |
| Rapid breathing | May accompany anemia or shock |
| Vomiting blood or coffee-ground material | Active upper GI bleeding possible |
Medication History Matters
Tell the veterinarian about every medication and supplement the cat has received. Never give human anti-inflammatory medicines unless a veterinarian specifically prescribes them for that cat.
What the Veterinarian May Check
Evaluation may include gum color and circulation, blood tests to check red blood cells and clotting, abdominal imaging, and investigation for gastrointestinal disease, toxins, or bleeding elsewhere.
Medication and Exposure History Matters
Tell the veterinarian about every medication, supplement, toxin exposure, and recent procedure—not only products labeled for cats. Gastrointestinal bleeding can be influenced by clotting problems, severe disease, or medication effects, and the timeline may change which tests are most useful.
Do not give human pain relievers to a cat with black stool. Some common human medications are dangerous to cats and may complicate bleeding or kidney injury.
The Safest Takeaway
True black tarry stool should be treated as possible digested blood, not simply a stool-color variation. The combination of melena with pale gums, weakness, or collapse is especially urgent.
Related Virixoo Guides
Read why pale gums can be an emergency warning sign. Read what mucus in a cat’s stool can mean. Read why a cat may suddenly collapse.
