Cat Poo: A Comprehensive Guide

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As a cat parent, cleaning out the litter box may not be one of your favourite activities (if it is, we have plenty of litter boxes for you here!). But checking cat poo to ensure it's a normal colour and shape is one of the ways you can spot signs of possible health problems.

Most cats poo at least once a day, and cat stool is a great indicator of your cat’s state of health. It can tell you if they are experiencing stress or an underlying illness, or if their cat food isn't agreeing with them.

By familiarising yourself with what "good poo" looks like, you can ensure that you're equipped to recognise when their stool doesn't seem normal. Of course, lots of us pet parents don’t have litter trays and virtually never see our cats’ poo because they go outside to go to the toilet. If this is the case, you can still look out for changes in how often your cat goes out or whether you notice soft or runny poo around their rear end. If you’re ever suspicious of problems, you can offer a litter tray and see for yourself.

Healthy vs. Unhealthy Cat Poo: What to Look For

Healthy poo is generally malleable (like modelling clay: not too soft, not too hard). This is considered the gold standard and is a sign your cat is passing their stool normally. Healthy stool is dark brown in colour, but not too dark, as blackish poo can mean blood in the stool. Poo that is too light also may indicate a more serious issue like liver disease, as it can be an indication that the bile duct is obstructed, says the Merck MSD Veterinary Manual.

Small, hard balls of poo are considered abnormal and unhealthy because they can be an indicator of constipation. This is a serious issue for cats because it may indicate problematic health concerns like neurological or metabolic conditions or a colon obstruction, notes International Cat Care (ICC). They add that constipation may also be a sign that your cat is dehydrated. You should definitely call your vet if your cat passes small, hard balls of stool.

Gray cat sleeping on the edge of a brown leather sofa.

You should also be on the lookout for soft or liquid-like stools that have no discernible shape. Cat diarrhoea is caused by a variety of things, from viral infections to intestinal parasites to food intolerance. If you aren't looking closely, you may mistake liquid stool for urine. Make sure you always take a good, close look at what you're scooping or use a pair of disposable gloves to test the texture.

Not all unusual cat poo is cause for panic, but it does require careful observation. The PDSA says it’s common for cats to have diarrhoea after a change in food, for example. But if this type of stool persists for more than 24 hours or is accompanied by vomiting, lethargy or bloody stools, they recommend taking your cat to the vet. It's better to be on the safe side.

Preparing Cat Stool Samples

At each annual visit, your vet will ask for a stool sample so the lab can perform tests on the faecal matter. Samples are best collected in approved plastic containers, which your vet's office will provide. But you also can pick up a container at the office before your appointment, or purchase one online or at a pet supply shop. Just remember: the lab will need a fresh sample, so it's important not to collect your treasure from the litter box until the day that you drop it off at the vet. Once you scoop the faecal matter into the approved plastic sample container, refrigerate if it’s possible and make sure to jot down the date and time of collection so the vet's office has accurate information.

Multiple Cats, Multiple Checks

If you have more than one cat, you do not necessarily have to collect a sample from each individual animal unless your vet specifically asks you to do so. If you find bloody stool, though, you'll probably have to be on litter box patrol to determine which cat may be experiencing a health issue. Of course, if one cat is ill, the others may be too. If you notice a serious issue with one cat, try to isolate them with their own litter box until you can bring them to the vet.

Believe it or not, your cat's stool can tell you a lot about their wellbeing. By incorporating a stool check into your daily litter box maintenance routine, you can help to keep them in tip-top shape and provide them with a clean, healthy environment.

Contributor Bio

Christine O'Brien

Christine O'Brien

Christine O'Brien is a writer, mum, and long-time cat parent whose two Russian Blues rule the house. Her work also appears in, What to Expect, and Fit Pregnancy, where she writes about pets, pregnancy, and family life. Find and follow her on Instagram and Twitter @brovelliobrien.


Reviewed by Dr. Hein Meyer, DVM, PhD, Dipl-ECVIM-CA and Dr. Emma Milne

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