Published: 28 August 2026
Written by: RoyalHugge Editorial Team
Finding loose or watery stool in your cat’s litter box can be worrying. A single soft stool may result from a minor digestive upset, but repeated diarrhoea can also indicate parasites, infection, food intolerance or an underlying health condition.
Quick Answer: What Should You Do If Your Cat Has Diarrhea?
If your adult cat has one or two soft stools but is still bright, eating, drinking and behaving normally, monitor them closely, provide fresh water and avoid introducing new foods or treats.
Contact a veterinarian promptly if the diarrhoea:
- Contains fresh blood or appears black and tar-like
- Is frequent, completely watery or getting worse
- Occurs with vomiting, lethargy, pain or loss of appetite
- Affects a kitten, senior cat or cat with an existing illness
- Continues for more than 24–48 hours
- Keeps returning
- May be related to a toxin or swallowed foreign object
Do not give human anti-diarrhoea medicine unless specifically instructed by a veterinarian.
What Does Diarrhea Look Like in Cats?
Diarrhoea is stool that is softer, wetter or passed more frequently than normal. It may range from slightly unformed stool to completely watery liquid.
Other changes can include:
- Increased urgency
- More frequent litter-box visits
- Small amounts of stool passed repeatedly
- Mucus around the stool
- Fresh red blood
- Unusually pale, yellow or dark stool
- A stronger or more unpleasant smell
- Straining during defecation
- Stool outside the litter box
According to the Cornell Feline Health Center, feline diarrhoea is often short-lived, but it can sometimes be a sign of a more serious or potentially life-threatening condition.
Common Causes of Diarrhea in Cats
Diarrhoea is a symptom rather than a disease. The appearance of the stool alone is not always enough to identify the cause.
1. A Sudden Change in Food
Changing a cat’s diet too quickly may disrupt their digestive system. This can happen when switching:
- From one brand to another
- From dry food to wet food
- To a new protein source
- To a richer or higher-fat diet
- To a new treat or supplement
When possible, introduce a new food gradually over several days. Cats with sensitive digestion may need an even slower transition.
2. Eating Something Unusual
Cats may develop diarrhoea after eating:
- Spoiled food
- Table scraps
- Excessive treats
- Dairy products containing lactose
- Food from the rubbish bin
- Plants, chemicals or other unsuitable substances
- Prey animals or contaminated raw meat
If you suspect your cat has swallowed a toxic substance or foreign object, do not wait for the diarrhoea to improve on its own. Contact a veterinarian immediately.
3. Intestinal Parasites
Roundworms, hookworms, Giardia, coccidia and Tritrichomonas are among the parasites and protozoa that may cause diarrhoea in cats.
Kittens, newly adopted cats and cats living in multi-cat environments can be particularly vulnerable. Even indoor cats are not completely protected from parasites.
Your veterinarian may request a fresh stool sample because different parasites require different tests and treatments. Deworming medication should not be selected by guesswork.
4. Infection
Bacterial, viral and protozoal infections can cause diarrhoea, sometimes together with vomiting, fever, dehydration or reduced appetite.
Feline panleukopenia is one important example, particularly in unvaccinated kittens. The Merck Veterinary Manual describes it as a highly contagious disease that can cause vomiting, diarrhoea and severe dehydration, with kittens often being the most seriously affected.
5. Stress
Cats may develop temporary digestive upset following:
- Moving to a new home
- Boarding
- Veterinary visits
- A new pet or family member
- Changes to their daily routine
- Conflict between cats
- Sudden environmental changes
Stress-related diarrhoea should still be monitored. Do not assume stress is the cause when other symptoms or repeated episodes are present.
6. Food Intolerance or Adverse Food Reaction
Some cats may react poorly to a particular ingredient or protein source. Possible signs include recurring diarrhoea, vomiting, poor coat condition, itching or weight loss.
A proper elimination diet should be planned with a veterinarian. Randomly changing foods makes it more difficult to identify the ingredient responsible and may create nutritional imbalances.
7. Medication or Supplements
Antibiotics and certain other medications can alter the intestinal environment or cause digestive side effects.
Introducing too much of a new supplement at once may also produce temporary gas or loose stool. Tell your veterinarian about every medication, supplement and treat your cat receives.
8. Chronic Digestive or Systemic Disease
Recurring or long-lasting diarrhoea may be related to conditions such as:
- Chronic enteropathy or inflammatory bowel disease
- Pancreatic disease
- Liver disease
- Hyperthyroidism
- Kidney disease
- Intestinal lymphoma or another cancer
- Vitamin B12 deficiency
- Problems with nutrient digestion or absorption
Feline inflammatory bowel disease may cause diarrhoea, vomiting, weight loss, bloody stool, lethargy and reduced appetite, according to the Cornell Feline Health Center.
These conditions cannot be diagnosed based on stool appearance alone.
When Is Cat Diarrhea an Emergency?
Seek veterinary attention promptly if your cat has any of the following warning signs:
- Repeated or completely watery diarrhoea
- A significant amount of fresh blood
- Black, sticky or tar-like stool
- Repeated vomiting
- Refusal to eat
- Extreme tiredness, weakness or collapse
- Signs of abdominal pain
- Pale gums
- A swollen or tense abdomen
- Suspected dehydration
- Rapid weight loss
- Possible toxin exposure
- Possible swallowed string, bone, toy or other foreign object
Continued fluid loss can cause dehydration and electrolyte imbalance. Severe cases may progress to shock, as explained by the Merck Veterinary Manual.
Kittens Need Earlier Attention
Kittens have smaller fluid reserves and may deteriorate more quickly than healthy adult cats.
A kitten with diarrhoea should receive prompt veterinary attention if they are:
- Lethargic
- Not eating
- Vomiting
- Passing blood
- Losing weight
- Producing frequent watery stool
A fresh stool sample is often useful for checking worms and other parasites.
What Can You Safely Do at Home?
Home monitoring is only appropriate when an adult cat has mild diarrhoea but remains alert, comfortable, hydrated and interested in food.
1. Keep Fresh Water Available
Make sure your cat can easily access clean water. Wet food may help increase water intake if it is already part of the cat’s normal diet and does not worsen the problem.
Do not force water into a cat’s mouth because liquid can accidentally enter the lungs.
2. Do Not Fast Your Cat Without Veterinary Advice
Cats should not automatically be fasted when they have diarrhoea.
Prolonged loss of appetite is especially concerning in cats. It may contribute to hepatic lipidosis, a potentially life-threatening liver condition associated with severe food avoidance. The Cornell Feline Health Center notes that anorexia commonly precedes this condition.
Offer small portions of an appropriate, familiar food unless your veterinarian recommends a therapeutic gastrointestinal diet.
3. Stop New Treats and Sudden Diet Changes
Return to the last diet your cat tolerated well. Avoid adding several new foods or supplements while trying to identify the cause.
Do not repeatedly switch between different proteins and brands during the same episode.
4. Monitor the Litter Box
Record:
- When the diarrhoea began
- How often it occurs
- Stool colour and consistency
- Whether blood or mucus is present
- Changes in appetite, water intake and behaviour
- Recent food, medication or environmental changes
In a multi-cat home, separate litter boxes or temporary monitoring may be necessary to identify which cat is affected.
5. Collect a Fresh Stool Sample
Place a recent sample in a clean, sealed container and ask the veterinary clinic how it should be stored before the appointment.
A photograph of the stool may also help, particularly if its appearance changes before the examination.
6. Avoid Human Medication
Do not give human anti-diarrhoea products, antibiotics, painkillers or leftover pet medication without veterinary instructions.
Diarrhoea can have many different causes. Suppressing intestinal movement without identifying the cause may be inappropriate, particularly when infection, toxicity or an obstruction is possible.
Can Probiotics Help a Cat With Diarrhea?
Probiotics may support intestinal microbial balance in some cats, but their effects depend on the strain, dose, product quality and underlying cause of the diarrhoea.
Research in cats remains limited and the results are mixed. One controlled study found fewer prolonged diarrhoea episodes in cats receiving a specific Enterococcus faecium probiotic, while newer evidence reviews note that probiotics should not be treated as a proven stand-alone treatment for acute feline diarrhoea. View the study on PubMed.
This means probiotics may be considered supportive care, but they cannot:
- Remove an intestinal blockage
- Treat poisoning
- Replace fluid therapy
- Eliminate every parasite
- Diagnose food intolerance
- Treat serious infection or chronic intestinal disease
- Replace a veterinary examination
Ask your veterinarian before introducing a probiotic when your cat is very young, immunocompromised, seriously ill, taking medication or experiencing severe or persistent diarrhoea.
Where Does RoyalHugge Probiotic Yogurt Cube Fit In?
RoyalHugge Triple-Biotics Probiotic Yogurt Cube is a treat-format digestive-support product developed for dogs and cats that may refuse powders or tablets.
It is intended for daily digestive support—not as an emergency treatment for active, severe diarrhoea.
It may be considered when a cat:
- Is otherwise well and eating normally
- Has already passed the initial observation or veterinary-assessment stage
- Needs an easier way to receive daily digestive support
- Tolerates the ingredients in the selected flavour
- Is introduced to the product gradually
RoyalHugge offers a chicken-free Duck, Pear & Pumpkin option for pets that need to avoid chicken ingredients. However, “chicken-free” does not mean the product is automatically suitable for every cat with diarrhoea or suspected food sensitivity.
When introducing any new digestive supplement, begin with a small amount and monitor stool consistency. Stop and seek veterinary advice if symptoms become worse.
How Will a Veterinarian Diagnose the Cause?
Depending on the cat’s age, medical history and symptoms, a veterinarian may recommend:
- Physical examination and hydration assessment
- Faecal testing for worms or protozoa
- Blood tests
- Urinalysis
- Thyroid testing in older cats
- Dietary trial
- Abdominal imaging
- Vitamin B12 testing
- Additional gastrointestinal testing
- Biopsy in selected chronic cases
Bring information about recent foods, treats, medications, supplements, travel, boarding, new pets and possible toxin exposure.
Frequently Asked Questions
How long can mild cat diarrhea last?
A single soft stool may resolve quickly. Contact a veterinarian if diarrhoea continues beyond 24–48 hours, becomes more frequent or occurs with another symptom. Do not wait two days when a kitten or unwell cat is affected.
Should I stop feeding my cat?
Do not fast your cat unless a veterinarian specifically instructs you to do so. Cats that stop eating can develop serious complications, particularly when they are overweight or already ill.
Can I give my cat chicken and rice?
Chicken and rice is not a complete and balanced diet for cats and chicken is unsuitable for cats with a suspected chicken sensitivity. Ask your veterinarian whether a properly formulated gastrointestinal diet is more appropriate.
Why does my cat have diarrhea but act normal?
Minor dietary changes, stress or a brief digestive disturbance may cause diarrhoea before other signs appear. However, parasites and early-stage illness are also possible. Monitor carefully and arrange a veterinary examination if the diarrhoea persists or returns.
What does blood in cat diarrhea mean?
Bright red blood often comes from the lower intestinal tract, while black, tar-like stool may indicate digested blood from higher in the digestive tract. Either finding deserves veterinary advice, especially when the amount is significant or other symptoms are present.
Can indoor cats get parasites?
Yes. Parasites may be introduced through contaminated shoes, insects, raw food, new animals or an infection acquired earlier in life. A stool test is the best way to determine whether a specific parasite is present.
Can probiotics make diarrhea worse at first?
Some cats may experience temporary gas or looser stool after a new supplement is introduced. Begin gradually and stop the product if symptoms worsen. Persistent diarrhoea should not be dismissed as a normal adjustment reaction.
Key Takeaway
Mild diarrhoea in an otherwise healthy adult cat may be monitored briefly, but frequent, bloody, persistent or recurring diarrhoea requires veterinary attention.
Focus first on hydration, continued appropriate nutrition, close monitoring and identifying the cause. Probiotics may offer digestive support for selected cats, but they are not a substitute for diagnosis or treatment.
References
- Cornell Feline Health Center — Diarrhea
- Merck Veterinary Manual — Digestive Disorders of Cats
- Cornell Feline Health Center — Inflammatory Bowel Disease
- Cornell Feline Health Center — Hepatic Lipidosis
- VCA Animal Hospitals — Diarrhea in Cats
- Bybee et al. — Effect of Enterococcus faecium SF68 on Diarrhea in Cats
- Merck Veterinary Manual — Feline Panleukopenia
This article is for general educational purposes and does not replace an examination, diagnosis or treatment plan from a qualified veterinarian.
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