ASPCA Logo

Diarrhea Causes and Treatments for Cats

Diarrhea is characterized by frequent loose or liquid bowel movements. It can be caused by something as simple as a change in diet or a more serious illness or infection. Diarrhea may be sudden in onset and short in duration. It can also last for weeks to months or occur off and on. A single bout of diarrhea is generally not a cause for concern in cats-but if it persists for more than a day or two, it can lead to dehydration.

What Causes Diarrhea?

  • Change in diet
  • Dairy or other food intolerance
  • Ingestion of spoiled food
  • Hairballs
  • Allergic reaction
  • Bacterial or viral infection
  • Internal parasites, such as roundworms, coccidia and Giardia
  • Inflammatory bowel disease
  • Kidney or liver disease
  • Cancer or other tumors of the digestive tract
  • Certain medications
  • Hyperthyroidism
  • Colitis

What Are the General Symptoms of Diarrhea?

Loose, frequent stools are the most common symptoms of diarrhea. Other signs include flatulence, the passage of blood in mucus or stool and straining to defecate. Lethargy, dehydration, fever, vomiting, decreased appetite, weight loss and an increased urgency to defecate may also accompany diarrhea.

If your cat's diarrhea is accompanied by bloody or black stools, he could be experiencing internal bleeding of the stomach or small intestine and should be examined by a vet immediately.

How Do I Treat Diarrhea?

It is often recommended that you avoid giving your pet any food for 12-24 hours while he's experiencing diarrhea, but do provide plenty of fresh, clean water to stave off dehydration. Check with your veterinarian about the proper course of treatment for your cat's specific case.

When Should I Take My Cat to the Vet?

Bring your cat to the vet if his diarrhea continues for more than a day, or if you observe lethargy, vomiting, fever, dark-colored or bloody stools , straining to defecate, decreased appetite or unexplained weight loss.