Loose stools in dogs are one of the most common digestive upsets owners face. They can be triggered by sudden diet changes, stress, or an imbalance in the gut bacteria that help with digestion. While a single soft stool isn’t unusual, persistent looseness means food isn’t being properly absorbed. It can lead to dehydration and nutrient loss if it continues. Keeping an eye on frequency, consistency, and your dog's general energy levels can otherwise help separate a passing blip, from something that might need more investigation.
quick summary
Loose stools in dogs are usually a sign the gut’s balance is off.
Common triggers include diet changes, stress, or bacterial imbalance
Usually short-term, but persistent looseness needs checking
Keep hydration up and monitor for blood or mucus
Ongoing or severe diarrhoea always warrants a vet visit
What is actually going on?
Loose stools occur when the large intestine can’t absorb enough water before waste passes out. This happens when food moves too quickly through the gut, and is often triggered by stress, bacteria imbalance, dietary irritation, or infection. When the intestinal lining is inflamed, it becomes less efficient at absorbing fluid and nutrients.
In mild cases, the digestive system resets within a day or two. But chronic loose stools indicate longer-term irritation or imbalance in the gut microbiome, the network of bacteria that help digest food and maintain the intestinal barrier.
Food intolerances, parasites, or sudden changes in diet can also cause inflammation. The result is softer, more frequent bowel movements, sometimes with mucus or undigested food visible.
While most episodes are mild, repeated loose stools can lead to dehydration and poor nutrient uptake.
Keeping track of your dog’s stool quality, appetite, and energy levels helps your vet identify whether it’s a temporary upset or an ongoing digestive issue.
How long is too long for my dog to have loose stools?
Mild loose stools lasting 1-2 days without other symptoms may resolve naturally. If soft stools persist beyond 48 hours, or if your dog shows lethargy, appetite loss, or there's blood in their poo, contact your vet immediately.
Why does my dog get loose stools when anxious or excited?
Probiotics may help support stool consistency in some dogs, particularly during mild, acute upset. Evidence shows mixed results - some dogs respond well, while others show little change. Strain selection matters.
