Most cases of cat diarrhea caused by diet changes, stress, or minor stomach upset resolve within a few days with simple home care. The key steps are keeping your cat hydrated, temporarily simplifying their diet, and watching for signs that something more serious is going on. Here’s how to handle it.
Figure Out What’s Causing It
Before you treat the symptom, think about what changed recently. The most common triggers for a brief bout of diarrhea are straightforward: a sudden switch to new food, a stressful event like a car ride or boarding stay, or, in kittens, the transition from milk to solid food. If you can trace the diarrhea to one of these, you’re likely dealing with something that will pass on its own with a little help.
When diarrhea in an adult cat isn’t clearly tied to a diet change or stress, it’s more likely connected to an inflammatory, infectious, or more serious gastrointestinal problem. Extended or recurring episodes can also signal conditions outside the gut entirely, including an overactive thyroid, kidney or liver disease, viral infections like feline distemper (panleukopenia), or lymphoma. That doesn’t mean you should panic over one loose stool, but it does mean persistent diarrhea (lasting more than two or three days) deserves a vet visit rather than continued home treatment.
Keep Your Cat Hydrated
Diarrhea pulls water out of your cat’s body fast, and cats are already prone to running low on fluids because they don’t drink much voluntarily. Dehydration is the most immediate risk, especially for kittens and older cats.
To check hydration at home, gently pinch the skin between your cat’s shoulder blades and let go. In a well-hydrated cat, the skin snaps back instantly. If it stays tented for a second or two before settling, your cat is already dehydrated. Other warning signs include sunken eyes, dry gums, and lethargy. Make sure fresh water is available at all times. You can also add a little extra water to wet food, or offer low-sodium chicken broth (no onion or garlic) to encourage drinking. If your cat’s skin tent is slow to return or their gums feel tacky and dry, they likely need veterinary fluid support rather than just a water bowl.
Simplify Their Diet
A bland diet gives your cat’s gut a chance to calm down without the complexity of regular cat food. The standard recipe is 75% boiled white rice mixed with 25% boiled lean chicken breast (no skin, no bones) or lean ground beef. Serve it in small portions, three to four times a day rather than one or two larger meals, so you’re not overwhelming the digestive system.
This isn’t a long-term diet. It’s missing nutrients cats need, so treat it as a two-to-three-day reset. Once stools start firming up, gradually transition back to your cat’s regular food over about a week. Mix increasing amounts of the regular food into the bland diet each day, roughly 25% more per day. Jumping straight back to normal food is one of the easiest ways to trigger another round of loose stools.
If your cat won’t eat the bland diet, try warming it slightly to release the smell. Cats are driven by scent more than taste, and cold food from the fridge often gets ignored.
Add Pumpkin for Fiber
Plain canned pumpkin (not pumpkin pie filling, which contains sugar and spices) is a reliable source of soluble fiber that absorbs excess water in the intestines and helps firm up stools. Most cats do well with 1 to 4 teaspoons per meal, depending on their size and how severe the diarrhea is. Start with a single teaspoon mixed into food and increase if needed. Many cats accept the taste easily, but if yours doesn’t, mixing it thoroughly into wet food usually does the trick.
Consider a Probiotic
Probiotics help restore the balance of beneficial bacteria in the gut, which diarrhea disrupts. One of the most effective strains for feline diarrhea is Saccharomyces boulardii, a beneficial yeast that’s widely available in capsule form. The typical therapeutic dose for an adult cat is 2.5 billion CFU (colony-forming units) twice daily, which works out to half of a standard 250mg capsule. For maintenance after the diarrhea resolves, a lower dose of around 1.25 billion CFU twice a day is common.
You can open the capsule and sprinkle the powder directly onto food. It’s also fine if the supplement contains other probiotic strains alongside it, as long as you’re getting enough of the active ingredient per dose. Veterinary-specific probiotic products formulated for cats are another option and take the guesswork out of dosing.
What Not to Give Your Cat
Never give your cat human anti-diarrheal medications like loperamide (Imodium) or bismuth subsalicylate (Pepto-Bismol) without veterinary guidance. Both can be toxic to cats. Dairy products, despite the stereotype of cats loving milk, tend to make diarrhea worse because most adult cats are lactose intolerant. Avoid fatty foods, table scraps, and treats until stools are consistently normal again.
Prolonged fasting is also risky for cats. While withholding food for 12 hours can sometimes help settle an upset stomach, cats that go without eating for more than 24 to 48 hours risk developing a serious liver condition called hepatic lipidosis, where the body starts mobilizing fat stores in a way the liver can’t handle. If your cat refuses to eat at all, that’s a reason to call your vet rather than wait it out.
Signs That Need Veterinary Attention
Home care is reasonable for a cat that’s otherwise acting normal, still eating and drinking, and has had loose stools for a day or two. But certain signs mean you should skip the bland diet and go straight to the vet:
- Blood in the stool (bright red or dark/tarry)
- Vomiting alongside diarrhea, which accelerates dehydration
- Diarrhea lasting more than 48 hours despite home care
- Lethargy, loss of appetite, or fever
- Kittens or senior cats with diarrhea of any duration, since they dehydrate faster and have less resilience
- Weight loss that accompanies recurring loose stools over weeks
Recurring diarrhea that clears up and comes back, even if each episode seems mild, can point to chronic conditions like inflammatory bowel disease, food allergies, hyperthyroidism, or intestinal parasites. A vet can run fecal tests, bloodwork, and imaging to identify the underlying cause rather than just treating the symptom each time it flares.