When Your Cat Has Diarrhea: Causes and Remedies

When Your Cat Has Diarrhea, Few things are about to worry more than peeking into the litter box and finding diarrhea—or worse, cleaning up messy surprises outside of it. While a single soft stool isn’t always alarming, persistent or severe diarrhea in cats can signal an underlying health issue that requires attention.

The good news is that in many cases, diarrhea is manageable at home and preventable with the right care. In this guide, we’ll cover the common causes of diarrhea in cats, home remedies that actually work, and when it’s time to call your veterinarian.

What Is Diarrhea in Cats? & When Your Cat Has Diarrhea?

Diarrhea is defined as frequent, loose, or watery stools. It’s not a disease itself, but a symptom of digestive upset or illness. Depending on the cause, diarrhea can last just a day or become a chronic condition.

While one-off episodes might clear up on their own, ongoing diarrhea can lead to dehydration, malnutrition, and other health risks. That’s why knowing the causes and remedies is so important.

Common Causes of Cat Diarrhea

There’s no single reason cats develop diarrhea—it can stem from diet, environment, or health conditions. Some of the most common causes include:

1. Sudden Dietary Changes

Switching food too quickly is the top cause of diarrhea. Cats’ digestive systems need 7–10 days to adjust to a new diet.

2. Food Intolerances or Allergies

Cats can react poorly to:

• Dairy (most cats are lactose intolerant)

• Low-quality fillers or artificial additives

• Certain proteins (chicken, beef, or fish)

3. Eating Something They Shouldn’t

Curious cats may eat spoiled food, trash, or toxic plants, all of which can irritate the stomach and cause loose stools.

4. Parasites

Roundworms, hookworms, coccidia, and giardia are common culprits—especially in kittens or outdoor cats.

5. Infections

Bacterial or viral infections (like feline panleukopenia) can disrupt digestion and cause diarrhea.

6. Stress or Anxiety

Big changes—moving, a new pet, or loud environments—can trigger stress-induced diarrhea.

7. Medications

Antibiotics and certain drugs may upset the gut temporarily.

8. Chronic Health Conditions

Diseases like inflammatory bowel disease (IBD), pancreatitis, hyperthyroidism, or kidney problems often present with diarrhea.

When to Worry About Cat Diarrhea

Not every case of diarrhea requires an emergency trip to the vet. However, call your veterinarian if you notice:

• Diarrhea lasting longer than 48 hours

• Blood or mucus in the stool

• Accompanying vomiting, lethargy, or loss of appetite

• Signs of dehydration (dry gums, skin tenting, sunken eyes)

• Diarrhea in kittens, elderly cats, or cats with preexisting health conditions

Safe Home Remedies for Mild Cat Diarrhea

If your cat is otherwise healthy and the diarrhea is mild, you can try supportive care at home.

1. Offer a Temporary Bland Diet

Feed easily digestible foods such as:

• Plain boiled chicken or turkey (no seasoning)

• White rice or unsweetened pumpkin puree

• Veterinary-recommended prescription diets

Gradually transition back to your cat’s regular food once stools normalize.

2. Keep Your Cat Hydrated

Diarrhea causes fluid loss. Encourage water intake with:

• Fresh water bowls in multiple spots

• Wet food (higher moisture than dry kibble)

• Cat-safe electrolyte solutions (only with vet guidance)

3. Probiotics for Cats

Veterinary probiotics help restore gut bacteria balance and improve stool quality.

4. Small, Frequent Meals

Break meals into smaller portions to reduce digestive strain.

5. Pumpkin for Fiber

A spoonful of plain canned pumpkin (not pumpkin pie filling) adds soluble fiber that helps firm stools.

What Not to Do

• Don’t give human medications. Over-the-counter drugs like Imodium or Pepto-Bismol are toxic to cats.

• Don’t starve your cat. Cats need regular meals; fasting can lead to serious issues like hepatic lipidosis.

• Don’t ignore symptoms that worsen. If diarrhea persists, veterinary care is crucial.

Veterinary Treatments for Cat Diarrhea

If your cat’s diarrhea doesn’t improve or is severe, your vet may recommend:

• Fecal tests to check for parasites

• Bloodwork to rule out organ issues

• Medication (dewormers, antibiotics, or anti-inflammatories depending on the cause)

• Prescription diets for sensitive stomachs or chronic conditions

The exact treatment depends on what’s causing the diarrhea.

Preventing Future Diarrhea Episodes

Once your cat recovers, prevention is key:

• Transition foods gradually over 7–10 days

• Choose high-quality diets with real protein and minimal fillers

• Avoid toxic or spoiled foods

• Keep cats on a regular parasite prevention plan

• Reduce stress with consistent routines and enrichment

• Schedule regular veterinary checkups

Special Note: Diarrhea in Kittens

Kittens are especially vulnerable to diarrhea because they can dehydrate rapidly. Causes often include:

• Parasites

• Stress from rehoming

• Sudden diet changes during weaning

If your kitten develops diarrhea, call a vet immediately—delaying treatment can be dangerous.

When your cat has diarrhea, it’s important to take it seriously but not panic. Sometimes it’s as simple as a diet change, while other times it’s a sign of infection or chronic illness.

By understanding the causes and remedies of cat diarrhea, you’ll be prepared to provide supportive care, know when it’s safe to try home remedies, and when to call the vet.

A healthy digestive system keeps your cat comfortable, hydrated, and happy—and that means fewer messy surprises for you too.