Dog Vomiting: When to See a Vet (and When It's an Emergency)

Call your vet now if

• Your dog is vomiting repeatedly, or can't keep even small amounts of water down.
• They are retching or trying to vomit but nothing comes up, especially if their belly looks swollen or tight. This can be a sign of bloat, which is an emergency, particularly in large, deep-chested dogs.
• The vomit contains blood, or dark material that looks like coffee grounds.
• You think they may have eaten something poisonous (see our toxic foods list) or swallowed an object such as a toy, sock, bone or corn cob.
• They are a young puppy, an elderly dog, a very small dog, or a dog with an existing health condition.
• They seem lethargic, weak, wobbly, or not themselves.
• They appear to be in pain: hunched, restless, reluctant to lie down, crying out, or guarding their tummy.
• Vomiting comes with diarrhoea, pale gums, collapse, or breathing that looks laboured.

If any of these apply, you do not need to wait and see. Ring your vet, or an out-of-hours emergency vet if your own practice is closed.

Vomiting or regurgitation?

It helps to know which one you are seeing, because your vet will ask.

Vomiting is an active process. Dogs often look uneasy first: drooling, licking their lips, swallowing repeatedly or pacing. Then you will see heaving from the belly before the contents come up. Vomit is often partly digested and may contain yellow fluid (bile).

Regurgitation is more passive. Food or fluid comes back up with little warning and little effort, often soon after eating. It usually looks undigested and may be tube-shaped. Regurgitation can point to problems with the food pipe rather than the stomach, so it is worth mentioning to your vet if it keeps happening.

Coughing that ends in a gag can also look a lot like vomiting. If your dog brings up a little white froth after a coughing fit, tell your vet about the cough too.

A one-off vomit in a bright dog

Many dogs vomit now and then and are completely fine afterwards. A reassuring picture looks like this:

• They vomited once, or perhaps twice close together, and then stopped.
• They are alert, wagging, and interested in what is going on.
• They can keep small sips of water down.
• Their gums look their normal pink colour.
• There is no blood, no swelling of the belly and no sign of pain.

Even in this case, keep a close eye on them for the rest of the day. Things can change, and a dog who seemed fine at first may become quiet later.

Common everyday causes

There are many possible reasons a dog might vomit. Some of the more everyday possibilities include:

• Eating too fast. Gulping a meal, especially after exercise, can lead to food coming straight back up.
• Scavenging. Rubbish, grass, dropped food, or something unpleasant found on a walk can upset the stomach.
• A sudden change of diet. Switching food overnight, or a rich treat they are not used to, can cause a short-lived upset.
• An empty stomach. Some dogs bring up a little yellow bile when they have gone a long time without food.
• Motion or excitement. Car journeys and over-excitement can make some dogs sick.

These are possibilities, not a diagnosis. Vomiting can also be linked with infections, parasites, and conditions affecting the gut, liver, kidneys or pancreas, among others. Only your vet can work out what is going on in your dog.

Safe steps for a mild one-off

If your dog has vomited once and seems otherwise well, these steps are sensible while you watch them:

• Keep fresh water available, in small amounts. Offering a little at a time is gentler than letting them gulp a full bowl, which can bring on more vomiting.
• Ask your vet before withholding food. Advice on whether, and for how long, to rest the stomach depends on your dog. It is especially important to check first with puppies, small breeds, and dogs with diabetes or other conditions, as going without food can be risky for them.
• Don't give human medicines. Many common human tablets are harmful to dogs, even in small amounts. Only give what your vet has prescribed for your dog.
• Watch closely. Check on their energy, comfort, gums and whether they keep water down. Look out for any of the warning signs above.
• Note what and when. Write down the time, what the vomit looked like, roughly how much there was, and anything your dog might have eaten. A photo can help your vet too.
• Remove temptation. Pick up anything they might scavenge, and keep bins and treats out of reach while they recover.

If anything changes, or you simply feel uneasy, ring your vet. They would much rather hear from you early.

When to book an appointment

Not every vomiting dog is an emergency, but some patterns deserve a proper check-up even if your dog seems bright between episodes:

• Vomiting that comes and goes over several days or weeks.
• Weight loss, or a coat that looks duller than usual.
• A change in appetite, whether eating less or seeming hungrier than normal.
• Drinking or weeing more than usual (see why your dog might be drinking more).
• Changes in their stools, such as ongoing diarrhoea.
• Regurgitation after meals that keeps happening.

These can all have a range of causes, and your vet may want to examine your dog and run some tests.

Keeping a clear record

When your vet asks "how often has this happened?", a clear answer makes a real difference. Logging episodes in Petopedia, alongside meals, water and energy levels, helps you give your vet an accurate picture rather than a best guess. You can create a free account to start tracking, and our guide to knowing your pet's normal explains what is worth noting day to day.

For more on recognising when something needs attention, read signs your pet needs a vet. And if your dog also has an upset tummy at the other end, see our guide to dog diarrhoea.