Cat Diarrhoea: Causes, Symptoms & Treatment

Cat diarrhoea is a common gastrointestinal issue affecting felines of all ages, characterised by loose, watery stools that can lead to dehydration if untreated. Understanding the underlying causes, recognising symptoms early, and knowing appropriate treatments is essential for cat owners to ensure their pet’s health and comfort.

What is cat diarrhoea?

Cat diarrhoea refers to the passage of loose or watery stools more frequently than normal, often accompanied by increased urgency. It can be acute (sudden onset, short duration) or chronic (lasting weeks or recurring). Acute cases often resolve with simple interventions, while chronic diarrhoea may signal serious health issues requiring veterinary diagnosis. Unlike normal firm stools, diarrhoeic faeces result from rapid transit through the intestines, preventing proper water absorption. Kittens and senior cats are particularly vulnerable due to their lower resilience to fluid loss.

Symptoms of diarrhoea in cats

Recognising diarrhoea early helps prevent complications. Key symptoms include:

• Loose, watery, or pudding-like stools
• Increased frequency of defecation
• Straining or discomfort during bowel movements
• Mucus, blood, or black tarry stools (indicating digested blood)
• Accidents outside the litter box
• Lethargy, weakness, or loss of appetite
• Vomiting or abdominal pain
• Dehydration signs: sunken eyes, dry gums, skin tenting

Severe symptoms like blood in stools, fever, or pale gums demand immediate vet attention, as they may indicate internal bleeding, infection, or toxicity.

Causes of cat diarrhoea

Diarrhoea in cats stems from diverse causes, broadly categorised as dietary, infectious, inflammatory, or systemic. Identifying the trigger is crucial for effective management.

Dietary causes

Sudden diet changes are a leading culprit, disrupting gut flora and causing loose stools. Transition foods gradually over 7-10 days. Food allergies or intolerances, spoiled food, treats, or human foods (e.g., milk) can provoke reactions. Inspect treats for contaminants or allergens toxic to cats.

Infectious causes

Parasites like worms, giardia, or coccidia irritate the gut, especially in kittens. Bacterial (e.g., Salmonella), viral (e.g., panleukopenia), or fungal infections are common, particularly in unvaccinated or outdoor cats.

Stress and environmental factors

Anxiety from new pets, moves, or travel triggers colitis, leading to frequent small-volume diarrhoea with mucus.

Medical conditions

Chronic issues include inflammatory bowel disease (IBD), pancreatitis, hyperthyroidism, liver/kidney disease, cancer, or diabetes. Foreign body ingestion (string, toys) causes obstruction. Medications like antibiotics disrupt gut bacteria.

Types of cat diarrhoea

Diarrhoea is classified by stool appearance and gut involvement:

• Small intestinal diarrhoea: Watery, large volume, weight loss, possible vomiting.
• Large intestinal (colitis): Small volume, frequent, mucus/blood, urgency.
• Mixed: Affects both, common in multifactorial cases.

Colour and consistency provide clues: yellow (malabsorption), green (bile), black (upper GI bleed).

When to see a vet for cat diarrhoea

Not all diarrhoea requires a vet, but seek help if:

• Lasts >24-48 hours
• Blood, black stools, or worms present
• Kitten, senior, or dehydrated cat
• Accompanied by vomiting, fever, lethargy, or pain
• No improvement after home care

Chronic cases (>2-3 days) need diagnostics like faecal tests, bloodwork, ultrasound.

Cat diarrhoea treatment

Treatment targets the cause:

• Fluid therapy: IV/subcutaneous for dehydration; oral rehydration solutions cautiously.
• Dietary management: Withhold food 12-24 hours (not water), then bland diet (boiled chicken/rice) for 3-5 days. Transition slowly.
• Medications: Antibiotics for bacterial causes, anti-parasitics, probiotics for gut health. Avoid OTC human drugs.
• Probiotics/Fibre: Restore flora; vet-recommended supplements.

Hospitalisation may be needed for severe cases.

Home remedies for cat diarrhoea

For mild acute cases:

• Fast 12-24 hours, offer ice cubes or small water amounts.
• Bland diet: boiled white rice and plain chicken (no skin/seasoning).
• Probiotics: Cat-specific products like FortiFlora.
• Monitor hydration: Pedialyte (diluted, vet-approved).
• Keep clean to prevent reinfection.

Never use Pepto-Bismol or Imodium without vet guidance—toxic to cats.

Preventing diarrhoea in cats

Proactive steps reduce risk:

• Consistent diet: High-quality food, gradual changes.
• Parasite control: Regular deworming/flea prevention.
• Vaccinations: Against viral diarrhoea.
• Stress reduction: Stable environment, pheromone diffusers.
• Annual check-ups: Early detection of issues.
• Avoid toxins, table scraps, garbage.

FAQs

Can cat diarrhoea go away on its own?

Yes, mild acute diarrhoea often resolves in 24-48 hours with fasting and hydration, but monitor closely.

Is cat diarrhoea contagious?

Some causes like parasites/viruses are; isolate affected cats and disinfect.

What home food helps cat diarrhoea?

Bland boiled chicken and rice, in small frequent meals.

How long is too long for cat diarrhoea?

Over 24-48 hours, or with other symptoms—see vet immediately.

Can stress cause diarrhoea in cats?

Yes, leading to colitis with mucus.