Section: Symptom Guides

Cat Diarrhea: When Should You Call the Vet?

Cat diarrhea can come from diet change, parasites, infection, stress, food intolerance, or chronic disease. Call your veterinarian if diarrhea is bloody, watery, repeated, or paired with vomiting, appetite loss, weight loss, or lethargy. Kittens and senior cats can decline quickly.

What symptoms or causes should I watch for?

  • Diet change: New food, treats, milk, or table food can upset a cat's gut.
  • Parasites: Kittens, outdoor cats, and recently adopted cats may have intestinal parasites.
  • Infection: Viral or bacterial illness can cause diarrhea, fever, and appetite loss.
  • Stress colitis: Moving, boarding, new pets, or litter box conflict can affect stool.
  • Chronic disease: Food allergy, inflammatory bowel disease, thyroid disease, or organ disease can contribute.

What can I safely do at home right now?

  • Save a stool sample: Ask your clinic whether to bring a fresh sample for testing.
  • Keep water available: Do not force fluids, but monitor drinking and hydration.
  • Avoid sudden food changes: Do not keep adding new foods to solve diarrhea.
  • Separate cats if needed: This helps identify which cat has diarrhea and protects others.
  • Call early for kittens: Young kittens can dehydrate and become weak quickly.

When is this an emergency?

Go to an emergency veterinary clinic now if you notice:

  • Blood, black stool, or large amounts of watery diarrhea.
  • Vomiting plus diarrhea or refusal to eat.
  • Weakness, collapse, dehydration, or pale gums.
  • Diarrhea in a kitten, senior cat, or cat with chronic illness.
  • Weight loss, fever, belly pain, or diarrhea lasting more than a short period.

What will my veterinarian check?

Your veterinarian may check hydration, weight, temperature, belly pain, stool parasites, diet history, and whether blood work is needed.

How can I reduce the risk next time?

Change diets gradually, keep parasite checks current, and isolate newly adopted cats until health status is clearer.

Related veterinary guides

References

Disclaimer: This article is for educational and informational purposes only. It does not constitute medical advice, does not establish a vet-client-patient relationship, and should not replace an in-person evaluation by a licensed veterinarian.