TL;DR: Watery diarrhea in cats is a medium-urgency condition that can quickly lead to dehydration and requires immediate veterinary care if blood is present or the cat is lethargic. Providing your vet with photos of the stool can expedite diagnosis and ensure your cat receives the correct priority during triage.
What causes watery liquid diarrhea in my cat and what does it mean?
Watery diarrhea occurs when the intestines are unable to absorb water or when the body actively moves fluids into the digestive tract to flush out irritants. This condition suggests the digestive system is under significant stress from factors such as:
- Sudden dietary changes
- Parasites
- Bacterial infections
- Toxin ingestion
How urgent is it if my cat has watery liquid diarrhea?
The urgency for watery liquid diarrhea is generally classified as Medium, but it becomes a high-priority emergency requiring immediate intervention if your cat is:
- Vomiting
- Lethargic
- Showing pale gums
- Passing diarrhea containing blood
Why should I take a photo of my cat's diarrhea for the veterinarian?
Taking a clear photo of the diarrhea is a vital tool for your veterinary team that allows them to:
- Determine the exact consistency and color
- Identify hidden red flags like mucus or digested blood (which looks like coffee grounds)
- Prioritize your cat’s case more accurately during triage
- Facilitate a faster diagnosis during your appointment
Clinical Context (Merck Veterinary Manual)
In cats presenting with watery liquid diarrhea, potential causes include feline leukemia virus, feline immunodeficiency virus, feline infectious peritonitis, and toxoplasmosis. Diagnostic evaluation should include physical examination for depression, dehydration, and abdominal pain; urinalysis to exclude renal causes of hypoalbuminemia; serum T4 concentrations to exclude hyperthyroidism; and serologic tests for feline leukemia and feline immunodeficiency viruses, which are important prognostic factors. Fecal examination for parasites is also warranted. Affected cats may exhibit extreme dehydration, potentially sitting for hours at their water bowl, and abdominal palpation may reveal thickened intestinal loops and enlarged mesenteric lymph nodes. Terminal cases may develop hypothermia, septic shock, and disseminated intravascular coagulation.
Chapter: Gastroenterology, Infectious Disease
Source: The Merck Veterinary Manual, 11th Edition (Page 797)