Symptom: Diarrhoea – Why does my pet have diarrhoea?

Diarrhoea is a common issue in pets and can happen for many reasons, from changes in diet to underlying health conditions. In this article, we’ll explain what different types of diarrhoea can look like, common causes of diarrhoea in pets, what you can do at home to help, and when it’s important to seek veterinary advice. 

Written by Dr. Mariella Roberts, Veterinary Surgeon, Animal Trust Vets CIC | Published October 2025 | Review date October 2028 | This advice is for UK pets only and is not a replacement for seeing a vet