Bilious vomiting syndrome

Affects: Dogs

Overview

Bilious vomiting syndrome in dogs is vomiting in response to bile-induced inflammation of the stomach. It is also known as reflux gastritis syndrome and duodenal-gastric reflux. Bile salts interfere with the gastric mucosal barrier, allowing acid to irritate the stomach lining and cause gastritis.

Dogs with this condition usually vomit in the morning after not eating all night. Treatment is to feed late at night. H2 blockers and antiemetics can also be used. Bilious vomiting syndrome is a diagnosis of exclusion, meaning that the dog is normal otherwise and no other causes of the vomiting have been found.

Educational information only. This page is general guidance and is not a substitute for professional veterinary advice. Never give medicines or change treatment without consulting a veterinarian. If your pet is unwell, contact OC Pets or seek emergency care.
Sources (reused under open licences, with thanks): Wikipedia — “Bilious vomiting syndrome” (CC BY-SA 4.0) · Compiled by OC Pets Veterinary Clinic, updated 15-06-2026.