What to Do If Your Cat Has Diarrhea – Causes, Remedies & Care Tips

Last Updated on July 31, 2025 by James Kim

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Note: This article is for informational purposes only and is not a substitute for professional veterinary advice. Always consult your vet for your cat’s specific needs.

Discovering that your cat has diarrhea can be both messy and concerning. Whether it’s a one-time occurrence or something that seems to linger, feline diarrhea is often a sign that something isn’t quite right with your cat’s digestive system. While a mild case might resolve on its own, chronic or severe diarrhea can signal deeper health issues that shouldn’t be ignored.

Just like humans, cats can experience digestive upset for a variety of reasons — from dietary changes and food intolerances to stress, parasites, or even underlying medical conditions. The good news? With a little knowledge and a proactive approach, you can often get to the root of the issue and help your furry friend recover comfortably and safely.

In this guide, we’ll walk you through what to do if your cat has diarrhea — including the most common causes, when it’s time to call the vet, and simple at-home remedies that may help ease your cat’s discomfort. You’ll also learn how to prevent future flare-ups and protect your cat’s overall gut health.

Let’s dig in and help your kitty feel better, fast.

Recognizing Diarrhea in Cats

Before you can treat your cat’s diarrhea, it’s important to recognize the signs — and understand what’s normal versus what requires immediate attention. Diarrhea in cats can range from mild and short-lived to severe and chronic, and identifying the type can help determine the right course of action.

What Does Diarrhea Look Like in Cats?

Diarrhea is generally defined as frequent, loose, or watery stools. You may notice:

  • A sudden increase in the volume or frequency of bowel movements
  • Stools that are unusually soft, unformed, or liquid-like
  • Stronger or more foul-smelling stool than usual
  • Accidents outside the litter box

The color and consistency of your cat’s stool can also offer clues. For example:

  • Yellow or green stool might suggest a bacterial imbalance or dietary issue.
  • Black, tarry stool may indicate bleeding in the upper digestive tract (a serious concern).
  • Mucus or blood in the stool can signal inflammation or infection.

Acute vs. Chronic Diarrhea

  • Acute diarrhea comes on suddenly and usually resolves within a day or two. It’s often caused by diet changes, mild infections, or stress.
  • Chronic diarrhea lasts more than a few days and can be a symptom of more serious problems like inflammatory bowel disease (IBD), parasites, or food allergies.

Other Signs to Watch For

Along with loose stools, your cat may show:

  • Lethargy or decreased energy
  • Reduced appetite
  • Dehydration (check by gently lifting the skin between the shoulders — if it doesn’t snap back quickly, dehydration may be present)
  • Vomiting or abdominal discomfort
  • Hiding or unusual behavior

If any of these symptoms accompany diarrhea, it’s a sign that your cat may need veterinary care sooner rather than later.

Common Causes of Cat Diarrhea

Understanding why your cat has diarrhea is the first step toward resolving it. Diarrhea itself isn’t a disease — it’s a symptom. There are many possible causes, ranging from simple dietary mistakes to more serious medical conditions. Below, we break down the most common culprits behind feline diarrhea.

1. Diet-Related Causes

One of the most frequent reasons for sudden diarrhea in cats is something they ate.

  • Sudden Food Changes: Cats have sensitive digestive systems, and a rapid switch in diet — even to a higher-quality food — can cause loose stools. Always transition to new food gradually over 7–10 days.
  • Food Intolerances or Allergies: Some cats react poorly to ingredients like dairy, beef, chicken, or grains. Diarrhea may occur alongside itching or vomiting.
  • Spoiled Food or Garbage Ingestion: Curious cats may eat something rancid or toxic, leading to digestive upset.
  • Overeating or Eating Too Fast: Eating too much in one sitting can also cause diarrhea, especially with rich or unfamiliar treats.

2. Intestinal Parasites

Parasites are especially common in kittens and outdoor cats but can affect any feline.

  • Roundworms, Hookworms, or Tapeworms: These internal parasites can irritate the gut and lead to diarrhea, weight loss, and a bloated belly.
  • Giardia and Coccidia: These protozoan parasites are microscopic but can wreak havoc on your cat’s GI tract, especially in younger or immunocompromised cats.
  • Fecal-Oral Contamination: Cats can contract parasites from contaminated water, litter boxes, or shared environments.

3. Infections and Illness

Certain bacterial, viral, and fungal infections can disrupt your cat’s gut.

  • Bacterial Infections: Salmonella, E. coli, or Campylobacter can cause severe gastrointestinal upset.
  • Viral Infections: Feline panleukopenia, feline leukemia virus (FeLV), or feline immunodeficiency virus (FIV) may present with diarrhea as a symptom.
  • Fungal Overgrowth (e.g., Candida): Imbalances in gut flora can sometimes lead to fungal issues and loose stools.

4. Stress and Environmental Changes

Cats are creatures of habit. Even minor disruptions can lead to stress-induced diarrhea.

  • Moving to a New Home
  • Introducing a New Pet or Family Member
  • Travel or Boarding
  • Loud noises or construction nearby

Stress affects gut motility and can cause inflammation in the digestive tract.

5. Chronic Health Conditions

If your cat’s diarrhea persists for more than a few days, underlying health issues could be to blame.

  • Inflammatory Bowel Disease (IBD): Chronic inflammation of the intestines that causes ongoing diarrhea and weight loss.
  • Hyperthyroidism: Common in older cats, this condition speeds up metabolism and often causes diarrhea alongside increased appetite.
  • Kidney or Liver Disease: Both organs help filter toxins; when they fail, GI symptoms often follow.
  • Cancer (e.g., Lymphoma): Although rare, GI cancers can cause persistent diarrhea, especially in senior cats.

6. Medications and Toxins

  • Antibiotics: These can disrupt the balance of gut bacteria, leading to diarrhea.
  • Toxins or Human Medications: Ingesting non-cat-safe substances can quickly lead to digestive issues or worse.

Quick Tip:

If you’re unsure about the cause of your cat’s diarrhea, collect a stool sample and take photos. This will help your vet diagnose the issue more accurately.

When to See a Veterinarian

While mild or short-lived diarrhea in cats is often manageable at home, there are times when it can be a sign of something far more serious. Knowing when to stop watching and start acting is critical for your cat’s health.

Here’s how to tell if your cat’s diarrhea requires professional attention.

Warning Signs That Require Immediate Vet Attention

If you observe any of the following symptoms along with diarrhea, contact your veterinarian right away:

  • Blood in the stool (bright red or dark and tarry)
  • Frequent vomiting
  • Lethargy or weakness
  • Dehydration (dry gums, sunken eyes, poor skin elasticity)
  • Loss of appetite for more than 24 hours
  • Fever (warm ears, shivering, fast breathing)
  • Diarrhea lasting more than 48 hours
  • Sudden weight loss

These symptoms can signal serious issues like internal bleeding, organ dysfunction, infections, or poisoning.

How Long Should You Wait?

If your otherwise healthy cat has a single loose stool but is eating, playing, and acting normally, you can monitor at home for 24–48 hours. However, if diarrhea continues beyond two days — or worsens — it’s time to involve your vet.

For kittens, senior cats, or cats with chronic illnesses, don’t wait. Even one day of diarrhea can cause rapid dehydration or complications.

What to Bring to the Vet

To help your veterinarian make a fast and accurate diagnosis, consider bringing:

  • A fresh stool sample in a sealed container or plastic bag
  • A record of diet changes or new foods
  • A list of treats, medications, or supplements your cat is taking
  • Photos or videos of your cat’s stool or behavior (optional but helpful)
  • Notes on litter box frequency, accidents, and any vomiting episodes

Affordable Virtual Vet Options

If you’re unsure whether a trip to the clinic is necessary, you can try a telehealth consult through services like:

  • Pawp – 24/7 chat with licensed vets (great for emergencies)
  • Vetster – Schedule video consults with local veterinarians

These services are especially helpful if you’re managing multiple cats or can’t get a vet appointment quickly.

At-Home Remedies and First Steps

If your cat is otherwise healthy and showing no signs of distress, there are a few safe steps you can take at home to help settle their stomach and support recovery. However, these should only be used in mild cases — and never as a substitute for veterinary care if symptoms are severe or persistent.

1. Withhold Food Temporarily (For Adult Cats Only)

Giving your cat’s digestive system a short break can help reduce inflammation in the gut.

  • Withhold food for 12 to 24 hours (never longer).
  • Do not withhold water — hydration is critical.
  • This method is not safe for kittens, elderly cats, or underweight cats.

2. Switch to a Bland Diet

Once the fasting period is over, reintroduce food slowly with something gentle on the stomach.

Vet-recommended bland diet options:

  • Boiled chicken breast (unseasoned) with plain white rice
  • Cooked lean turkey with pumpkin puree (not pumpkin pie filling)
  • Prescription GI recovery food (e.g., Hill’s Science Diet i/d, Royal Canin Gastrointestinal)

Feed small portions (2–3 tablespoons) every 3–4 hours and monitor your cat’s response.

Amazon Recommendation: Hill’s i/d Digestive Care or Royal Canin Gastrointestinal Moderate Calorie.

3. Keep Your Cat Hydrated

Dehydration is one of the most dangerous complications of diarrhea. Make sure your cat is drinking enough water.

  • Provide fresh, clean water at all times.
  • Use a cat water fountain to encourage drinking.
  • Offer unflavored Pedialyte (1:3 ratio with water) if your vet approves.

Signs of dehydration:

  • Skin doesn’t snap back quickly when gently pulled at the shoulders
  • Dry or sticky gums
  • Lethargy or weakness

Amazon Recommendation: Cat-safe electrolyte supplements like Hydra Care by Purina.

4. Add a Probiotic

Probiotics can help restore healthy gut flora and reduce inflammation in the digestive tract.

  • Look for vet-formulated probiotics specifically for cats.
  • Popular options: Purina FortiFlora, Nutramax Proviable-DC

Start with a small dose and monitor for improvement over 24–48 hours.

Amazon Recommendation:

5. Monitor the Litter Box Closely

Keep a close eye on the consistency, frequency, and appearance of your cat’s stool. Use a notebook or app to track changes.

  • Clean the litter box more frequently to reduce risk of reinfection.
  • Use unscented litter during recovery to avoid further irritation.

Avoid These Common Mistakes

  • Don’t give human medications like Imodium or Pepto-Bismol — many are toxic to cats.
  • Don’t continue normal feeding if your cat is clearly unwell — consult a vet.
  • Don’t use home remedies meant for dogs — feline systems are more sensitive.

Cleaning and Preventing Further Issues

When your cat has diarrhea, it’s not just their health that needs attention — it’s also your home. Diarrhea can be messy, smelly, and even contagious, especially if caused by parasites or infections. Proper cleanup and prevention can make a big difference in stopping the cycle.

1. Clean the Litter Box Thoroughly and Often

Loose stools can stick to the sides of the litter box or track outside of it, making frequent cleaning essential.

  • Scoop multiple times per day
  • Do a deep clean every 1–2 days during diarrhea episodes
  • Use mild, unscented soap and hot water
  • Avoid bleach unless fully rinsed — lingering fumes can irritate your cat

Amazon Recommendation: enzyme-based litter box cleaners like Rocco & Roxie Stain & Odor Eliminator or Nature’s Miracle Cat Cleaner.

2. Disinfect Common Areas

If your cat has had accidents outside the box, act fast to prevent the spread of bacteria or parasites.

  • Use enzyme-based cleaners safe for pets
  • Avoid ammonia-based products — they can worsen odors and be harmful
  • Wash bedding, blankets, or fabric toys in hot water

High-touch areas to sanitize:

  • Bedding and blankets
  • Carpet or rugs
  • Carrier interiors
  • Scratching posts and window ledges

3. Protect Other Pets

If you have more than one cat, isolate the sick one temporarily to avoid spreading infections or parasites.

  • Use a separate litter box and food/water bowls
  • Wash your hands between handling different pets
  • Monitor all cats for symptoms over the next several days

4. Groom Your Cat if Needed

Cats with diarrhea may accidentally soil their fur, especially long-haired breeds.

  • Gently clean the rear with warm water and fragrance-free baby wipes
  • Trim long fur around the back end if needed
  • Avoid using shampoos with harsh chemicals or fragrances

Amazon Recommendation: Fragrance-Free Pet Wipes or Vet’s Best Waterless Cat Bath Foam

5. Reduce Triggers for Future Episodes

Some diarrhea episodes are caused by stress or environmental changes. Reduce risk by:

  • Keeping a consistent feeding schedule
  • Slowly introducing any new foods
  • Providing a calm, quiet environment
  • Using calming aids like Feliway or catnip sprays if your cat is anxious

How to Prevent Diarrhea in the Future

While occasional digestive upsets can happen, there are several proactive steps you can take to reduce the chances of your cat experiencing diarrhea again. Prevention comes down to consistency, cleanliness, and regular care.

1. Make Dietary Changes Slowly

One of the most common causes of diarrhea is a sudden switch in food.

  • Always transition to new foods gradually over 7–10 days.
  • Start with 75% old food and 25% new, slowly increasing the new food each day.
  • Avoid frequent brand switching or trendy diets unless medically necessary.

2. Feed a High-Quality, Consistent Diet

Choose a nutritionally balanced food that supports digestive health.

  • Look for limited-ingredient formulas if your cat has known sensitivities.
  • Choose brands with no artificial additives or fillers.
  • Avoid raw food diets unless under veterinary guidance — they may carry bacteria like Salmonella or E. coli.

Read more: on “Best Cat Foods for Sensitive Stomachs”.

3. Regular Deworming and Parasite Control

Even indoor cats can get parasites from fleas, contaminated shoes, or new pets.

  • Deworm regularly according to your vet’s recommendations.
  • Use vet-approved flea and parasite prevention monthly.
  • Have your vet perform fecal exams annually or if digestive symptoms arise.

Amazon Recommendation: Revolution Plus or Profender Topical Dewormer.

4. Reduce Environmental Stress

Stress affects gut health and immune response, which can trigger diarrhea.

  • Provide plenty of hiding spots, perches, and enrichment
  • Use calming aids like Feliway diffusers
  • Keep litter boxes clean and in quiet locations
  • Avoid abrupt changes in routine or environment

Read more: “How to Help Your Cat Adjust to a New Home” or “Reducing Stress in Indoor Cats”

5. Stay on Top of Vet Checkups

Regular wellness exams can catch issues before they turn into full-blown problems.

  • Annual exams (or twice yearly for senior cats)
  • Routine bloodwork and parasite testing
  • Consult your vet at the first sign of recurrent digestive issues

6. Supplement for Digestive Support

Some cats benefit from regular use of gut-friendly supplements.

  • Probiotics help balance gut bacteria and boost immunity
  • Digestive enzymes may aid cats with absorption issues
  • Pumpkin powder or fiber supplements can firm up soft stools

Amazon Recommendations:

Final Thoughts

Cat diarrhea isn’t just unpleasant — it can also be a warning sign that your furry friend’s health needs attention. While many cases are mild and resolve on their own, others may indicate infections, stress, food sensitivities, or more serious underlying conditions. By observing your cat’s behavior, taking fast action, and knowing when to involve your vet, you can protect their health and comfort.

Start with simple at-home steps: ensure hydration, try a bland diet, and add probiotics. If symptoms persist or worsen, don’t wait — get professional help. And remember, prevention is powerful. A stable diet, clean environment, routine parasite control, and stress reduction can all play a major role in keeping your cat’s digestive system healthy and happy.

A little awareness now can spare your cat (and you) a lot of trouble down the road.

Take Action for Your Cat’s Health Today

Don’t wait for a small issue to become a serious one. If your cat has diarrhea, start by following the at-home steps above and monitor their condition closely. For persistent symptoms, be sure to schedule a vet visit right away — your cat’s comfort and well-being depend on it.

To help you take action now:

Learn how to help your cat adjust to new environments – Tips to Reduce Stress in Cats During Change »

Keep your home clean and safe during recovery – Safe Cleaning Products for Cat Owners »

Support their gut health with proven probiotics:

Ease their tummy with prescription GI foods:

Prevent dehydration with Hydra Care or Pedialyte:

Disclaimer: The information provided on this site is for general informational purposes only. It is not intended as veterinary advice, diagnosis, or treatment. Always seek the guidance of a licensed veterinarian before making decisions about your pet’s health.

Results Disclaimer: Results may vary. Our recommendations are based on editorial research and do not guarantee specific outcomes.

Accuracy Notice: We strive to keep content accurate and up to date. However, always verify current information and consult a veterinarian for personalized guidance.

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