Dog throwing up yellow foam or bile
Yellow vomit is usually bile, a digestive fluid made by the liver and released into the small intestine. A single episode of yellow foam in the morning or before a meal, in a dog that is otherwise eating and playing normally, is often linked to an empty stomach. Repeated vomiting, retching with nothing coming up, blood, diarrhea, or a dog that seems weak or in pain needs a vet now.
General health information, not a diagnosis. If you are worried about your pet, contact a vet.
How urgent is it?
Go down the list and stop at the first row that matches your pet.
See a vet now
- Retching or trying to vomit with little or nothing coming up, especially with a swollen belly, restlessness or heavy drooling
- Blood in the vomit, or material that looks like coffee grounds
- May have eaten something toxic (such as chocolate, xylitol, grapes or raisins) or an object such as a toy, sock or bone, even if your dog still seems fine
- Weak, very lethargic, wobbly or collapsed, has a fever, or the belly seems painful when touched
- Vomits again and again within a few hours, or can’t keep even water down
- Seems dehydrated, or is pacing, hunched over, whining or breathing fast
- Also has diarrhea, or has stopped eating
See a vet within 24 hours
- Has vomited three or more times today but is alert, eating and keeping water down
- Vomiting has gone on for more than 24 hours, even if your dog seems fine
- Also vomits at other times of day or brings up food, has had a lasting change in appetite, or is losing weight
Watch at home
- Threw up yellow foam or liquid once or twice, often in the morning or before a meal, and is otherwise eating, drinking, playing and pooping normally
- It keeps coming back on some mornings with no other signs: keep watching, and book a regular appointment so the vet can rule out other causes
Not sure which row fits?
Describe your pet’s symptoms and get a free urgency check in about a minute.
Check my pet’s symptomsCommon causes
| Cause | What you may notice | Usual urgency |
|---|---|---|
| Empty stomach (bilious vomiting syndrome) | A small amount of yellow froth, usually early in the morning or before meals; the dog is fine afterward | Watch |
| Eating something it shouldn’t | Vomiting after getting into the trash, eating grass or table scraps; often settles within a day | Watch |
| Chronic illness (for example liver or kidney disease, food intolerance) | Vomiting that keeps coming back over weeks, weight loss, drinking more | Within 24 h |
| Infection or intestinal parasites | Vomiting together with diarrhea | Now |
| Swallowed object | Repeated vomiting, not eating, belly pain | Now |
| Toxic food or substance | Vomiting after eating chocolate, xylitol, grapes or raisins; can be followed by lethargy, wobbliness or seizures | Now |
| Pancreatitis | Repeated vomiting with belly pain and not eating | Now |
| Bloat or stomach twisting (GDV) | Retching with nothing coming up, swollen belly, restlessness, drooling; more common in large, deep-chested breeds | Now |
What you can do at home
- Keep fresh water available at all times. If your dog gulps a lot at once and vomits again, offer small amounts more often.
- If your adult dog brought up food after eating something odd, but otherwise seems well, a short break from food (about 12 hours) followed by small portions of a plain, easily digested meal is commonly advised. This does not apply to yellow foam on an empty stomach (see the next point). Ask your vet first for puppies, older dogs and dogs with an illness.
- If the yellow vomit tends to happen in the morning, try a small snack at bedtime taken from the day’s food, or split the food into smaller, more frequent meals.
- Write down when it happened, how often and what came up, and take a photo of the vomit. This helps the vet.
What not to do
- Do not take water away, unless a vet tells you to.
- Do not give human medicines or stomach remedies unless a vet tells you to.
- Do not wait to see if it passes if your dog may have eaten something toxic or swallowed an object. Call a vet right away.
- Do not wait if your dog is retching with nothing coming up and the belly looks swollen. This can be life-threatening within hours.
What to tell the vet
- When the vomiting started, how many times it has happened and at what times of day
- What it looked like: yellow foam, food, blood or dark material like coffee grounds (show the photo)
- Anything your dog may have eaten: trash, toys, bones, people food, medicines or plants
- Other signs: diarrhea, appetite, energy, drinking, weight change
- What and when your dog eats, and any recent change of food
Questions owners ask
Why does my dog throw up yellow foam in the morning?
Vomiting bile early in the morning or before breakfast is thought to be linked to a long time without food overnight. Vets call the recurring form bilious vomiting syndrome. In a study of 20 dogs with the condition, 12 vomited in the early morning, and most of the few dogs that tried a late evening meal or smaller, more frequent meals improved. If it keeps happening, a vet should rule out other causes first.
Is yellow vomit an emergency?
Usually not when it happens once and your dog is otherwise acting normally. It becomes urgent when your dog vomits repeatedly, can’t keep water down, retches with nothing coming up, has blood in the vomit or diarrhea, stops eating, seems weak or in pain, or may have eaten something toxic or an object.
Should I feed my dog after it throws up yellow?
If it was a small amount of yellow foam and your adult dog seems well, there is usually no need for a long fast, because this kind of vomiting is thought to be linked to an empty stomach. Keep water available. If the vomiting comes back after eating, or your dog is a puppy, older or has a health condition, call your vet before feeding again.
What is the yellow liquid my dog threw up?
It is usually bile, a digestive fluid that is made by the liver, stored in the gallbladder and released into the small intestine. When the stomach is empty, bile can move back into the stomach and irritate it, which can lead to vomiting yellow fluid or foam.
My dog throws up yellow but acts normal. Should I see a vet?
If it happened once, you can usually watch at home. If it keeps happening, even once a week, book a regular appointment. Bilious vomiting syndrome should only be settled on after other causes, such as diet problems, parasites or other illnesses, have been ruled out.
Sources
- Vomiting in Dogs (Pet Owner Version), Merck Veterinary Manual
- Vomiting in Dogs, VCA Animal Hospitals
- Vomiting, Cornell Richard P. Riney Canine Health Center
- Bilious Vomiting Syndrome in Dogs: Retrospective Study of 20 Cases (2002–2012), Journal of the American Animal Hospital Association, 2016
- Why Is My Pet Vomiting? Here’s One Option, University of Illinois College of Veterinary Medicine
- Bilious Vomiting Syndrome in Dogs, American Kennel Club
- Gastric Dilation and Volvulus in Small Animals, Merck Veterinary Manual
- People Foods to Avoid Feeding Your Pets, ASPCA Animal Poison Control
Last reviewed October 25, 2026