Causes
Canine enteric coronavirus, spread through faeces. Puppies and dogs kept in groups are more susceptible. It is usually far milder than parvovirus.
Diagnosis
The vet rules out parvovirus (far more serious) with a test.
Treatment
Supportive care: hydration and a bland diet. Most recover within a few days.
Prevention
Hygiene, vaccination (included in some schedules), and avoiding overcrowding.

