Most cases of cat diarrhea resolve within a day or two with simple changes at home: a temporary bland diet, plenty of fresh water, and a break from treats or rich food. If loose stools last longer than two days, contain blood, or come with vomiting, fever, or weakness, your cat needs veterinary attention rather than home remedies.
Never Give Human Anti-Diarrheal Medications
Before covering what works, it’s worth flagging the most dangerous mistake cat owners make. Loperamide (the active ingredient in Imodium) and bismuth subsalicylate (Pepto-Bismol) are both unsafe for cats. Cats have a limited ability to metabolize these drugs. Loperamide in particular can cross into the brain and cause excitatory behavior, vomiting, abdominal pain, difficulty walking, drooling, and even dangerous heart rhythm changes. Bismuth subsalicylate contains a compound related to aspirin, which cats process extremely slowly, making toxic buildup likely even at small doses. Keep both out of reach and never dose your cat with anything designed for people unless your vet specifically instructs you to.
Start With a Bland Diet
The most widely recommended approach is switching your cat to a simple, easy-to-digest meal for a few days. The standard bland diet is 75% boiled white rice mixed with 25% boiled, skinless, boneless chicken breast or lean ground beef. Shred or finely chop the meat and mix it thoroughly with the rice. Serve it at room temperature in small portions, three to four times a day, rather than one or two large meals. This gives the gut less work to do at once.
Feed this bland mix for two to three days after stools start firming up, then gradually transition back to your cat’s regular food over another three to four days. Mix increasing amounts of the normal food into the bland diet (roughly 25% more each day) so the digestive system adjusts without a sudden shock.
Current veterinary guidance does not recommend fasting cats with diarrhea. Unlike dogs, cats are prone to a dangerous liver condition when they go without food for even relatively short periods. Keep calories going in, just keep them simple.
Keep Your Cat Hydrated
Diarrhea pulls water out of the body fast. A cat that becomes dehydrated on top of having loose stools can deteriorate quickly, especially kittens and older cats. Make sure fresh water is always available, and consider offering low-sodium chicken broth (with no onion or garlic) to encourage drinking.
You can check hydration at home with two quick tests. First, gently lift the skin over your cat’s shoulder blades and let go. In a well-hydrated cat, the skin snaps back almost immediately. If it stays “tented” or returns slowly, your cat is dehydrated. Second, press a finger briefly against your cat’s gums. They should feel moist and slick, not dry or tacky. Other signs of dehydration include lethargy, weakness, poor appetite, and eyes that look sunken. One note: older cats sometimes have reduced skin elasticity even when hydrated, so the skin test alone isn’t reliable in senior cats.
Consider a Probiotic
Probiotics formulated for cats can help restore the balance of gut bacteria disrupted during a bout of diarrhea. The best-studied strain for this purpose is a specific bacterium sold under the brand name FortiFlora (among others). In a controlled study of 217 shelter cats, those receiving this probiotic had diarrhea lasting two or more days only 7.4% of the time, compared to 20.7% in the group receiving a placebo. That’s roughly a threefold reduction.
Look for a veterinary probiotic rather than a human supplement, since the strains and doses are tailored to feline digestive systems. Probiotics come as powders you sprinkle on food, making them easy to administer even to picky eaters.
Add Fiber to Firm Things Up
A small amount of soluble fiber can help absorb excess water in the intestines and improve stool consistency. Plain canned pumpkin (not pumpkin pie filling, which contains sugar and spices) is the most accessible option. Start with about half a teaspoon mixed into food once or twice daily for an average-sized cat. Psyllium husk powder is another option that has been studied in cats and shown to increase stool bulk and moisture balance, though getting the dose right matters. If you want to try psyllium, start with a quarter teaspoon per meal and adjust based on your cat’s response.
What Causes Diarrhea in Cats
Understanding the cause helps you decide whether home care is enough. The most common triggers for a short bout of diarrhea are dietary indiscretion (eating something unusual, a sudden food switch, or table scraps), stress (a new pet, a move, houseguests), and mild viral infections that clear on their own.
Parasites are another frequent cause, especially in kittens and cats that spend time outdoors. Roundworms are the most common intestinal parasite in cats. Hookworms can cause diarrhea along with weight loss, and heavy infections lead to anemia from blood loss. Coccidia, a single-celled parasite, is particularly problematic in kittens, where it can destroy the intestinal lining and cause mucousy diarrhea. Giardia infects the small intestine and causes acute or chronic diarrhea, though many infected cats show no symptoms at all.
Less common but more serious causes include bacterial infections, inflammatory bowel disease, food allergies, hyperthyroidism, and certain cancers. Chronic diarrhea lasting more than two to three weeks almost always has an underlying medical cause that requires diagnosis.
When Home Care Isn’t Enough
Take your cat to the vet if any of the following apply:
- Duration: Frequent liquid or semi-liquid stools persist for more than two days.
- Blood: You see red blood or dark, tarry stool.
- Other symptoms: Vomiting, fever, weakness, abdominal pain, loss of appetite, or signs of dehydration appear alongside the diarrhea.
- Age: Kittens and senior cats dehydrate faster and have less reserve to fight off infections.
- No improvement: If a bland diet and supportive care haven’t produced firmer stools within four days, further testing or more aggressive treatment is likely needed.
What Happens at the Vet
Your vet will typically start with a physical exam and a fecal test. The traditional method, called a fecal float, uses a solution to separate parasite eggs from stool so they can be identified under a microscope. It’s affordable and widely available but depends on the skill of the person reading the slide and can miss smaller parasites or low-level infections.
A newer option is a fecal PCR panel, which detects parasite DNA directly. This is significantly more sensitive and can identify organisms the float misses, including Giardia, Tritrichomonas (a protozoan that causes chronic large-bowel diarrhea), and even Toxoplasma. PCR testing can also flag drug-resistant hookworm strains, which is useful if a standard dewormer doesn’t resolve the issue. It costs more than a float, but many vets now offer it as a first-line test because it catches more.
If parasites are ruled out, the next step is usually a dietary trial. Your vet may recommend a hydrolyzed protein or novel protein diet fed exclusively for at least two weeks to determine whether a food allergy or sensitivity is driving the problem. No treats of any kind during this period. Dietary modification alone resolves symptoms in more than half of cats with chronic digestive issues. If diet changes don’t help, blood work, imaging, or intestinal biopsies may follow.