What causes dogs to have frequent diarrhoea?

If your dog has frequent diarrhoea, you need to find the cause and treat it. The most common ones are: 1. cold, gastrointestinal discomfort caused by the change of season, you may need to keep warm and regulate the stomach. 2. change of dog food, some dogs will also have diarrhoea when changing dog food, you need to give your dog a suitable dog food. 3. indigestion. 4. parasitic diseases. 5. viral diseases, etc.