Black Cat Poop: What It Means
Home > Blog > Poop Scanner > Black Cat Poop
Black cat poop describes stool that is very dark brown to black in color.
Updated: 2026-07-31
Quick Answer
Black, tarry cat poop may indicate digested blood from the upper gastrointestinal tract, a condition called melena. This can result from stomach ulcers, intestinal bleeding, or certain medications. However, dark stool can also follow dietary changes or iron supplements. Black tarry stool accompanied by weakness, vomiting, or appetite loss should be treated as urgent.
POOP SCANNER
Describe what you see and get a prioritized, evidence-based assessment of possible causes.
This tool provides general information and does not replace a veterinarian's diagnosis.
What This May Mean
Black cat poop describes stool that is very dark brown to black in color. When stool appears black and tarry rather than merely dark brown, it may indicate the presence of digested blood, a sign known as melena. Melena typically signals bleeding in the upper gastrointestinal tract, such as the stomach or small intestine, where blood is digested as it passes through.
Cats are obligate carnivores, and their stool reflects diet, hydration, and digestive health. Because most cats use litter boxes, owners have a regular opportunity to observe stool color, consistency, and frequency. Changes in litter box habits or stool appearance can sometimes be the first sign of a health issue, which is why paying attention to what is normal for your cat is important.
Possible Causes
Several factors may contribute to this stool appearance in cats. A veterinarian can help determine which are relevant for your cat.
- Digested blood from upper gastrointestinal bleeding, which turns stool black and tarry (melena)
- Stomach ulcers or inflammation that can cause slow, persistent bleeding
- Ingestion of blood from grooming a wound or from oral or nasal bleeding
- Certain medications, including some anti-inflammatory drugs, that can irritate the stomach lining
- Dietary factors such as foods high in iron, blood-based treats, or activated charcoal that can darken stool without indicating disease
Keep in mind that stool changes can result from more than one factor at the same time. A veterinarian can perform a physical exam, fecal testing, blood work, or imaging to narrow down the cause. Avoid making assumptions based on appearance alone, since different conditions can produce similar stool changes.
Home Observation
When monitoring this change at home, the following details can help you and your veterinarian assess the situation:
Determine whether the stool is truly black and tarry or just dark brown. Note the texture, odor, and whether it is sticky or unusually foul-smelling. Check for signs of weakness, pale gums, vomiting (especially material that looks like coffee grounds), appetite loss, or collapse. Take a photo and record the date and any recent medication or dietary changes.
Litter Box Monitoring Tips
- Scoop the litter box at least once daily so you can notice changes promptly
- Note the number of stool clumps, their size, color, and consistency each day
- Take a clear photo of unusual stool so you can show your veterinarian
- Track whether your cat is spending more or less time in the litter box than usual
- Keep a simple log of dates, dietary changes, and any other symptoms
When to Contact a Veterinarian
Black, tarry stool should be treated as potentially serious. Contact a veterinarian promptly if you notice melena, especially if it is accompanied by weakness, pale gums, vomiting blood or coffee-ground material, appetite loss, collapse, or abdominal pain. Kittens, seniors, and cats with existing illness are at higher risk.
Signs that warrant urgent veterinary attention include:
- Large amounts of blood in the stool or dark, tarry stool
- Repeated vomiting, especially with blood or coffee-ground material
- Severe lethargy, collapse, or weakness
- Pale gums or signs of dehydration (sunken eyes, dry gums, skin tenting)
- Abdominal pain, swelling, or distress
- No stool production for more than two days with straining
Kittens, senior cats, and cats with existing medical conditions are at higher risk of complications and should be evaluated promptly.
If you are unsure whether the situation is urgent, calling a veterinary clinic for guidance is a reasonable step. Many clinics can advise you over the phone on whether your cat should be seen immediately or can wait for a scheduled appointment. Having a photo of the stool and a record of when changes started can help the veterinary team triage the situation.
Frequently Asked Questions
Is dark brown cat poop the same as black poop?
No. Healthy cat stool is typically medium to dark brown. Truly black, tarry, foul-smelling stool (melena) can indicate digested blood and is different from naturally dark brown stool. If the stool is sticky, unusually foul-smelling, and jet black rather than dark brown, veterinary evaluation is recommended.
What should I do if my cat's poop is black?
Collect a sample or take a clear photo for your veterinarian. Seek same-day veterinary care if the stool is tarry and accompanied by weakness, pale gums, vomiting, or appetite loss. Do not wait if these signs are present, as gastrointestinal bleeding can worsen quickly.
POOP SCANNER
Describe what you see and get a prioritized, evidence-based assessment of possible causes.
This tool provides general information and does not replace a veterinarian's diagnosis.
Sources
- Cornell Feline Health Center, Cornell University College of Veterinary Medicine
- VCA Hospitals, Veterinary Clinical Articles
- Merck Veterinary Manual, Merck & Co., Inc.
Disclaimer
This article and the PawAI Poop Scanner tool provide general information and do not replace examination, diagnosis, or treatment by a licensed veterinarian. If your cat shows concerning signs, contact a veterinarian.