Symptom guide

Why Is My Dog Vomiting? Causes and When to Worry

Why dogs vomit, how to tell vomiting from regurgitation, what you can do at home, and the signs that mean your dog needs a vet today.

Updated October 2026 · 8 min read · By the Hushku editorial team · 3 sources

See a vet within 24 hours. Same day if repeated, bloody or with other signs

Short answer

A single vomit in a dog that is otherwise bright, eating and drinking is usually from eating something it shouldn't have, and often settles within 24 hours. See a vet the same day if vomiting is repeated, lasts more than a day, contains blood, or comes with lethargy, diarrhoea, belly pain or a swollen belly, or if your dog may have eaten a toxin or an object.

Key facts

A single vomit in a bright, well dog often settles within 24 hours.
See a vet if vomiting lasts more than a day, keeps coming back or comes with blood, lethargy or diarrhoea.
Retching without bringing anything up, with a swollen belly, can be bloat: go to a vet now.
Regurgitation (effortless, often after eating) is different from vomiting and points to the food pipe.

This guide is general information, not a diagnosis. If your pet seems unwell, or you're worried, call your vet.

Overview

Vomiting is one of the most common reasons dogs see a vet. Most cases are short-lived and caused by "dietary indiscretion": scavenging, rubbish, rich table food or a sudden change of food. But vomiting is also a sign of serious problems, including poisoning, a blockage, pancreatitis and organ disease.

Vomiting or regurgitation? Vomiting is active: your dog will usually look nauseous first (licking lips, drooling, swallowing, restlessness) and you'll see the belly heaving. Regurgitation is passive: food or water comes back up without effort or warning, often soon after eating, and usually points to a problem with the oesophagus (food pipe). Tell your vet which you've seen.

Retching but nothing comes up? In a large, deep-chested dog, unproductive retching with a swollen belly can be bloat (GDV), a surgical emergency. Go to a vet immediately.

Go to a vet now if you see

Retching without bringing anything up, with a swollen or hard belly (possible bloat)
Blood in the vomit, or vomit that looks like coffee grounds
Repeated vomiting, or vomiting water as well as food
Your dog may have eaten a toxin, medicine or an object
Lethargy, collapse, pale gums or severe belly pain
A puppy, a very small dog or an elderly dog that keeps vomiting

Common causes

1. Eating something it shouldn't (dietary indiscretion)
Usually mild
Rubbish, spoiled food, fatty scraps or grass. Usually a one-off or short bout in a dog that otherwise seems well.
2. Sudden change of food
Usually mild
Switching foods without a gradual transition can cause vomiting and loose stools. Use a 7 to 10-day switch.
3. Intestinal parasites
Needs a vet
Roundworms and other parasites, especially in puppies, can cause vomiting and diarrhoea. Regular deworming prevents most cases.
4. Poisoning
Serious
Chocolate, xylitol, grapes and raisins, human medicines, rat bait and some plants can all cause vomiting. Call a vet straight away if you suspect any toxin.
5. A swallowed object (foreign body)
Serious
Toys, socks, corn cobs and bones can block the stomach or intestines. Repeated vomiting, especially of water, and not eating are warning signs.
6. Pancreatitis
Serious
Inflammation of the pancreas, often after a fatty meal. Signs include vomiting, belly pain (a 'praying' position) and lethargy.
7. Infections
Serious
Viral and bacterial infections, including parvovirus in unvaccinated puppies, which also causes severe, often bloody diarrhoea.
8. Kidney, liver or hormonal disease
Needs a vet
Ongoing or intermittent vomiting, especially with weight loss or drinking more, can be a sign of illness elsewhere in the body.
9. Inflammatory bowel disease and food intolerance
Needs a vet
Recurring vomiting over weeks or months may be due to chronic gut inflammation or a reaction to something in the diet.

What you can do at home

For a single episode in a bright adult dog, rest the stomach for a few hours, but keep fresh water available in small amounts.
Then offer small portions of a bland, easily digested food (or a vet gastrointestinal diet) several times a day.
If there's no more vomiting, return to the normal food gradually over a few days.
Don't give human anti-sickness or stomach medicines unless your vet tells you to.
Note how often, what it looks like and anything your dog might have eaten; it helps your vet.

When to see a vet

Any of the emergency signs above: go now
Vomiting that lasts more than 24 hours or keeps coming back
Vomiting with diarrhoea, fever or not eating
Vomiting in a puppy that isn't fully vaccinated
Repeated vomiting over weeks, even if your dog seems fine in between

Prevention

Keep bins, food and toxic items out of reach
Change foods gradually over 7 to 10 days
Keep up with deworming and vaccinations
Avoid fatty table scraps and cooked bones
Choose toys that are too big to swallow

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Sources

We check guides against veterinary sources and update them when guidance changes. How we write and review.

Questions.

Should I feed my dog after it vomits?

Wait a few hours after a single vomit, then offer a small amount of bland food. If it keeps that down, give small meals over the day and return to normal food gradually. If it vomits again, call your vet.

Why is my dog vomiting yellow foam?

Yellow foam is usually bile, often seen when the stomach is empty, for example first thing in the morning. If it happens regularly, a smaller late-evening meal may help; mention it to your vet.

Why is my dog vomiting but acting normal?

A one-off vomit in a dog that is otherwise bright is often from eating something unsuitable. Keep an eye on it; if it happens again or other signs appear, call your vet.

Is it bloat if my dog is retching?

If a large, deep-chested dog is retching without bringing anything up and the belly looks swollen, treat it as bloat and go to an emergency vet straight away.

Key facts

Overview

Go to a vet now if you see

Common causes

1. Eating something it shouldn't (dietary indiscretion)

2. Sudden change of food

3. Intestinal parasites

4. Poisoning

5. A swallowed object (foreign body)

6. Pancreatitis

7. Infections

8. Kidney, liver or hormonal disease

9. Inflammatory bowel disease and food intolerance