Dog Throwing Up Yellow: Causes, Home Care and When to Worry

What Does Yellow Vomit Mean?

The yellow or yellow-green color comes from bile, which normally helps digest fat in the small intestine. When the stomach is empty, bile can flow back into it and irritate the lining, causing nausea and vomiting of yellow fluid or froth rather than food.^1,2 Yellow vomit usually means the stomach was empty (or already emptied by earlier vomiting), but not why the dog vomited, so look at the whole picture: how often it happens, and whether your dog is otherwise well.^4,3

Common Causes of a Dog Throwing Up Yellow

• Bilious vomiting syndrome (empty stomach): yellow vomiting after a long gap between meals, usually early in the morning, in an otherwise healthy dog. It's typically not life-threatening, but other causes should be ruled out.^1,4
• Dietary indiscretion or gastritis: eating garbage, grass, rich food or something that disagreed with the stomach.⁶
• Food changes or food intolerance.
• Pancreatitis: often with belly pain, lethargy and loss of appetite. See pancreatitis in dogs.³
• Swallowed objects or intestinal blockage, especially in young large-breed dogs.⁷
• Inflammatory bowel disease (IBD) and other chronic gut problems. See IBD in dogs.^3,9
• Liver or kidney disease, and Addison's disease (a hormone disorder). See Addison's disease in dogs.^3,5
• Stomach or intestinal cancer (uncommon).^3,4
• Toxins and some medications.³

Vomiting vs Regurgitation

True vomiting involves heaving and forceful belly contractions, and usually follows signs of nausea such as drooling, lip-licking or restlessness. Regurgitation is quick and passive, with no warning, and brings up undigested food or fluid from the esophagus.³ Telling your vet which one you see helps narrow down the cause.

What to Do at Home

If your dog vomited yellow once and is otherwise bright, alert and interested in food:

• Make sure fresh water is always available.³
• Your vet may suggest a short break from food, then small, frequent portions of a bland food for a day or two.^3,10
• For morning yellow vomiting, split your dog's normal daily food into smaller, more frequent meals, including one late in the evening. Don't add extra food; just divide the existing amount.^1,4
• Keep a note of when vomiting happens, what it looks like and anything your dog may have eaten.

Don't give human anti-nausea or stomach medicines unless your vet recommends them; some, such as Pepto-Bismol, aren't safe for every dog, and Pepto-Bismol can turn stool black, which can be confused with digested blood.^11,10 If vomiting continues or other signs appear, see a vet. See vomiting and diarrhea in dogs.

What Your Vet May Do

Your vet will examine your dog and may recommend blood tests, X-rays or ultrasound to rule out problems such as a blockage, pancreatitis, or liver, kidney or hormone disease.^3,7 If bilious vomiting syndrome is suspected, feeding changes are usually tried first, sometimes with stomach-protecting or motility medicines.^4,1 In the main study, 60% of dogs with bilious vomiting syndrome improved with treatment.⁴

Frequently Asked Questions

Why is my dog throwing up yellow?

Usually because the stomach is empty and bile has flowed back into it. Other causes include gastritis, pancreatitis and blockages.

Should I be worried if my dog throws up yellow?

Not usually after a single episode in a well dog. Worry if it's repeated, or comes with lethargy, belly pain, blood or diarrhea.

Why does my dog throw up yellow in the morning?

This is typical of bilious vomiting syndrome, which is linked to an empty stomach overnight.

What can I give my dog for throwing up yellow?

Fresh water and, if your vet agrees, small bland meals. For morning vomiting, try a small late-evening meal from the normal daily ration.

What should I feed my dog after yellow vomit?

Small, frequent portions of a bland food, then a gradual return to normal food if there's no more vomiting.

Is yellow vomit a sign of kidney or liver disease?

It can be, along with many other causes. Repeated vomiting, weight loss or increased thirst need blood tests.

What color is vomit from an intestinal blockage?

It varies; it can be food, yellow bile or brown fluid. Repeated vomiting and not eating are more telling than the color.

Is yellow foam vomit an emergency?

Not usually on its own, but repeated vomiting, unproductive retching or a swollen belly are emergencies.