Why is my dog’s vomit yellow?
Yellow vomit in dogs is most often bile, a digestive fluid made by the liver and stored in the gallbladder. Bile can reach the stomach and be brought up when the stomach has little or no food in it. It may look yellow, greenish-yellow, or foamy.
One episode in an otherwise well dog is often not serious. But bile can also appear when something else is wrong, so the full picture matters more than the color alone.
Common causes
An empty stomach
Dogs who go a long time between meals, especially overnight, may bring up bile in the early morning. It is sometimes called bilious vomiting. It can be a sign that the stomach is irritated by being empty, though your vet should still check if it happens often.
Eating something unusual or fatty
Rich table scraps, garbage, or a sudden change of food can irritate the stomach. Very fatty meals are associated with pancreatitis in some dogs, which needs veterinary care.
Food reactions and ongoing digestive disease
Food intolerance or allergy, stomach ulcers, inflammatory bowel disease, and other digestive illness can cause repeated vomiting. If your dog vomits regularly, even if they seem fine in between, ask your vet to look into it.
Blockage, toxins, and other emergencies
Vomiting can also come from a swallowed object, a toxin or medication, infection, or diseases of the liver, kidneys, or other organs. Repeated vomiting after swallowing a toy, sock, or bone is a reason to seek urgent care. See dog intestinal blockage treatment for more.
What the color and texture can tell you
Color is a clue, not a diagnosis.
- Yellow or yellow-green liquid or foam: often bile, as above.
- White foam: can occur with an empty stomach, but also with coughing-type conditions, so note whether it seems to come from the stomach or the throat.
- Brown or smelling strongly: can be caused by food, or in some cases by more serious problems. Mention this to your vet.
- Red, or dark like coffee grounds: may indicate blood. Contact a vet promptly.
Pink or red-tinged foam
Pink foam may contain a small amount of blood, which can come from an irritated throat or stomach, or from something more serious. A dog who is otherwise acting normally may still need a check, especially if it happens more than once. Take a photo and call your vet for advice the same day.
When to call a vet
Contact a vet or an emergency clinic promptly if the yellow vomit comes with:
- Repeated vomiting, or vomiting that does not stop
- Lethargy, weakness, or collapse
- Blood in the vomit or black, tarry stool
- A tight, swollen, or painful belly, or a hunched posture
- Diarrhea, or refusal to drink
- A suspected swallowed object or toxin
- Your dog being a puppy, a senior, or having an existing illness
Also book a visit if the vomiting keeps recurring over days or weeks.
What you can do at home
If your dog is a healthy adult who vomited once or twice and is otherwise bright, these steps are commonly suggested:
- A short rest from food for adult dogs only. Do not fast puppies, seniors, small dogs, or dogs with medical conditions unless your vet says so.
- Small amounts of water, offered gradually, rather than a big bowl at once, which can bring on more vomiting.
- Small, bland meals once vomiting has stopped, such as plain cooked lean protein with plain white rice, for a short period. Ask your vet about amounts.
- A light, low-fat snack before bed if your dog tends to vomit bile in the morning, as long as your vet is comfortable with it.
If your dog is also refusing water, see how to hydrate a sick dog and call your vet. There is no guaranteed fastest cure. Rest and gentle feeding are about supporting recovery. If it does not clear quickly, see a vet.
What not to give
Do not give human antacids, pain relievers, anti-nausea medicines, or stomach remedies unless a vet has told you which product to use and how much. Several are unsafe for dogs, and some can hide or worsen a serious problem. Do not try to make your dog vomit.
What the vet may do
A vet may examine your dog, check hydration, and ask about diet and what your dog may have eaten. Tests such as bloodwork, imaging, or a stool test may be recommended. Treatment could include anti-nausea medication, fluids, a diet change, or treatment of an underlying cause.
Preventing morning bile vomiting
Talk with your vet about meal timing. Some dogs do better with a slightly later evening meal or a small snack before bed. Avoid sudden diet changes and fatty table scraps. Recurrent episodes still deserve a vet check.
Frequently asked questions
What are the possible causes of a dog getting sick?
Dietary upset, infection, parasites, toxins, swallowed objects, medications, and organ or digestive disease are all possible. If diarrhea is also present, see when to see a vet for dog diarrhea, and for gentle supportive care read about home treatment for dog diarrhea.
Is yellow vomit an emergency?
Not always, but it can be. A single episode in a bright, hungry dog is lower concern. Any of the warning signs above makes it urgent.