By Dr Duncan Houston
The litter tray can reveal a change before your cat looks unwell. A softer stool, repeated visits or a new streak of blood is useful information, but appearance alone cannot identify a disease.
Compare today's findings with your cat's usual pattern, then consider appetite, energy, vomiting and whether urine is being passed normally. Those details decide how quickly to seek help.
Quick Answer
Healthy cat poo is usually brown, formed and easy to pass, without visible blood or persistent mucus. A single mildly soft stool in an otherwise well adult may be monitored closely, but repeated changes need veterinary advice. Black tarry stool, substantial bleeding, severe illness or repeated straining with little or no urine need urgent assessment.
What normal cat poo looks like
A typical stool holds its shape when scooped but is not a collection of very dry, hard pellets. Brown shades vary with diet, and poo naturally has an odour. Smell alone cannot tell you whether parasites, infection or another problem is present. PDSA's veterinary guidance describes normal stool as firm and dark brown.
Many cats pass stool daily, but food intake, diet and individual habits affect the pattern. Do not treat an exact number of hours as a universal rule. A cat repeatedly trying and failing to pass something needs help even if they produced a normal stool earlier.
A practical stool guide
| Finding | Possible explanation | What to do |
|---|---|---|
| Brown, formed stool passed comfortably | Usually normal | Continue normal care and note your cat's baseline. |
| One softer stool, with normal appetite and activity | A temporary digestive change is possible | Monitor subsequent stools and contact your vet if it repeats or other signs develop. |
| Frequent loose or watery stool | Diarrhoea from dietary, infectious, inflammatory or other causes | Seek advice promptly, especially for a kitten or medically vulnerable cat. |
| Hard dry pieces or painful attempts to pass stool | Constipation may be present | Contact your vet; first consider whether the straining could be urinary. |
| Red streaks or mucus | Irritation or bleeding, often from the lower bowel | Arrange veterinary advice; more urgent if repeated, substantial or accompanied by illness. |
| Black, sticky or tarry stool | Possible digested blood | Seek urgent veterinary assessment. |
| Persistently unusual yellow, green or pale stool | Several dietary or digestive explanations are possible | Photograph it and contact your vet; colour does not diagnose liver disease. |
| Rice-like pieces near the bottom or on fresh stool | Tapeworm segments are possible | Photograph or collect a sample for identification and discuss parasite control. |
PDSA explains the difference between fresh and digested blood. Lighting and litter can change how stool looks, so describe both colour and texture to the clinic.
Straining can be a urinary emergency
A cat crouching repeatedly in the tray may be trying to urinate rather than defecate. If little or no urine is coming out, or you cannot tell what is happening, contact an emergency vet immediately. This is particularly concerning in male cats. Do not press on the abdomen or give a constipation remedy first.
The American College of Veterinary Surgeons identifies urinary obstruction as an emergency. Crying, genital licking, restlessness, hiding and vomiting can accompany it; you do not need to wait for all these signs.
Other reasons to seek urgent care
Go urgently for black tarry stool, large amounts of blood, collapse, marked weakness, repeated vomiting, a painful swollen abdomen or suspected ingestion of string, a toxin or another foreign object. Never pull string protruding from the anus or mouth.
Contact your vet promptly if your cat stops eating, seems dehydrated, loses weight, has repeated diarrhoea or passes persistently narrow stools. Kittens, frail older cats and cats with existing disease need an earlier assessment. Do not apply a blanket two-day waiting period to them.
Why the stool has changed
Diet changes, food intolerance, parasites and infections can cause diarrhoea. Persistent episodes may prompt investigation of intestinal inflammation or disease elsewhere in the body. VCA's diarrhoea guidance explains why stool changes must be interpreted alongside the examination and other symptoms.
Constipation can involve dehydration, painful toileting, medications, obstruction or poor movement of the colon. Treatment depends on the cause and how much stool has accumulated. Cornell's constipation guidance describes why some cats require veterinary treatment rather than added fibre alone.
Useful steps before your appointment
- Record when the change began, how often stool is passed and whether normal urine clumps are present.
- Note recent food changes, treats, medicines, parasite products and access to rubbish, plants or string.
- Photograph a fresh stool before litter obscures it. Ask the clinic how to collect and store a sample.
- Keep fresh water available. Ask about feeding if your cat is unwell; do not deliberately starve a cat to stop diarrhoea.
- In a multi-cat home, try to identify the affected cat without stressful prolonged isolation. Tell your vet if several cats are affected.
Testing may include a stool examination, blood tests or imaging depending on the findings. A normal-looking stool does not exclude parasites. VCA notes that tapeworm segments may be recognised by owners even when routine stool testing misses them.
Common mistakes
- Starting human laxatives, enemas, antidiarrhoeal medicines or oils without veterinary instructions.
- Adding pumpkin or other fibre automatically to every stool problem.
- Switching diets repeatedly before a clear assessment.
- Assuming all white specks are worms, or that no visible worms means none are present.
- Changing to unfamiliar litter simply to inspect stool, potentially discouraging tray use.
Prevention starts with consistent care
Use a nutritionally complete diet suited to your cat, introduce planned food changes gradually and keep water easily available. Keep trays clean and accessible, especially for cats with mobility difficulties. Follow your vet's parasite plan based on age, hunting, fleas and local risks rather than a universal schedule.
Frequently Asked Questions
Is dark brown poo the same as black tarry poo?
No. Dark brown can be normal. An unusually black, sticky appearance warrants urgent advice because digested blood is possible.
Can a cat have diarrhoea and still be constipated?
Small amounts of liquid can sometimes pass around retained stool. Repeated straining needs an examination, not a guess based on one soft deposit.
Should I give a dewormer for white specks?
Get them identified and ask which product is suitable. Different parasites need different treatment, and tapeworm management may also require flea control.
Does one normal stool mean the problem is over?
It is encouraging, but continue watching appetite, comfort and subsequent stools. Recurrent changes or weight loss still need follow-up.
Make observations useful
You do not need to diagnose your cat from the litter tray. A clear description and prompt attention to distress can help your vet choose the right next step.
For help understanding stool changes and preparing questions for your vet, visit ASK A VET™.
The ASK A VET™ Tracker logs live location and activity trends, so a change in routine never goes unnoticed.
Every ASK A VET article is written and reviewed by qualified veterinarians.
