Bilious vomiting syndrome in dogs: management
6-year-old Shih Tzu that for months has vomited a small amount of frothy yellow fluid first thing in the morning, before breakfast. The rest of the day it is normal, eats well and is not losing weight. Examination and bloods are normal. It is fed once a day, in the afternoon.
What is the most appropriate initial measure?
chevron_right Show answer and explanation
A. Split the ration into several meals, with a meal or snack late in the evening
Correct. Bilious vomiting syndrome is linked to prolonged fasting and duodenogastric reflux of bile. Shortening the overnight fast is usually enough; if not, a prokinetic may be considered after ruling out other causes.
B. Immediate endoscopy with gastric biopsies
In a dog that is well between episodes, with a normal examination and bloods, dietary management is tried first. Endoscopy is reserved for non-response or new signs.
C. 24-hour fast to rest the stomach
Fasting is precisely the trigger: prolonging it would worsen the vomiting.
D. Long-term omeprazole, since bile indicates a gastric ulcer
Bile in vomit only indicates duodenal content in the stomach; it does not indicate an ulcer. Antacids do not correct the mechanism of the syndrome.
lightbulb Key takeaway
It is a diagnosis of exclusion: vomiting of bile on an empty stomach in a dog that is well between episodes. If the pattern changes (more frequent, at other times, with weight loss or laboratory changes), investigate chronic gastritis or enteropathy.
Test yourself with 10 random questions
Gastroenterology · 100 questions, a different test every time
Related questions
Updated: October 31, 2026 · Educational content for veterinary professionals. It does not replace current clinical guidelines or the judgement of the attending veterinarian.