Dog Vomiting: When to Watch and When to Call the Vet

Dogs vomit more easily than people. A dog that eats grass, gulps dinner or picks something up on a walk may be sick once and then be completely fine. But vomiting is also a sign of some serious problems, and it helps to know which situations need a vet straight away. This guide is about recognising those situations — it is not a substitute for advice from your vet.

Call the Vet Immediately If

• Your dog is retching or trying to vomit but nothing comes up, especially with a swollen belly — this can be a sign of bloat, an emergency
• There is blood in the vomit, or it looks like coffee grounds
• Your dog may have eaten something toxic or a foreign object — a toy, a sock, a corn cob, bones
• Vomiting is repeated several times in a short period
• Your dog is lethargic, weak, collapsing or in obvious pain
• Your dog is a puppy, very small, elderly or has a known health condition
• There is diarrhoea at the same time, especially with blood
• Your dog cannot keep water down

When It May Be Reasonable to Watch

For a healthy adult dog that has vomited once, is otherwise bright and alert, still wants to drink and has no other symptoms, many vets will suggest watching closely. Ring your vet for advice if you are unsure — a phone call is free compared with a missed problem. Call back straight away if anything changes.

Vomiting or Regurgitation?

These are different, and your vet will want to know which:

• Vomiting is active — heaving, abdominal contractions, often drooling and restlessness first. The contents are usually partly digested.
• Regurgitation is passive — food comes back up with little effort, often soon after eating, and looks undigested and tube-shaped.

What to Note Before You Call

• When it started and how many times
• What the vomit looked like — food, liquid, foam, bile, blood, foreign material
• When your dog last ate and drank
• Anything unusual eaten, or any access to bins, toxins or toys
• Stools, energy and appetite
• Any recent food change or new medication

A photo of the vomit, unpleasant as it is, can genuinely help your vet.

Common Causes

• Eating too fast, or eating grass or something found on a walk
• A sudden food change
• Bin raiding or rich food
• Swallowed objects
• Infections, parasites, toxins, and a range of illnesses that need a vet to diagnose

Things Not to Do

• Do not give human medication — many are toxic to dogs
• Do not try to make your dog vomit unless a vet tells you to
• Do not keep offering food while your dog is vomiting — follow your vet's advice on when and what to feed

Recurring Vomiting

A dog that vomits every week or two, even if it seems well in between, needs a vet check. Keep a simple log of each episode — date, time, what came up, what was eaten — so your vet can see the pattern.

Frequently Asked Questions

Is it normal for a dog to vomit yellow foam?

Yellow bile on an empty stomach, often in the morning, is fairly common. If it happens regularly, or with other symptoms, talk to your vet.

My dog vomited once and seems fine. Should I worry?

Watch closely and call your vet for advice if you are unsure, if it happens again, or if any other symptom appears.

Why does my dog eat grass and then vomit?

Many dogs eat grass, and some vomit afterwards. Occasional grass eating is common, but frequent vomiting is worth discussing with your vet.