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If you’re like me, then the sight of your dog vomiting is a cause for immediate concern. I want to know why my dog is vomiting, and what I should do about it. The problem with trying to figure that out, of course, is that vomiting is listed as a possible symptom for a huge range of canine conditions, and sorting through pages and pages of Google articles is almost as bad as using WebMD’s symptom checker—I end up convinced that the worst case scenario is the most likely.

Sorting through all of that information is tricky, which is why we came up with this list of possible causes for dog vomiting, along with the steps you need to take to get your dog help.

When Is Dog Vomiting Normal?

Before we get to the causes of vomiting, we need to distinguish between vomiting and regurgitation. When a dog vomits, they are forcefully the contents of their stomach and upper small intestine, while regurgitation is a passive motion that expels undigested food and fluids, often preceded by difficulty breathing and coughing.

Long-term dog owners know that vomiting is not uncommon. Occasionally, healthy dogs will get sick for no apparent reason and then continue with their day as if nothing happened. Your dog could have eaten too quickly, swallowed something disagreeable, or merely snacked on too much grass. This type of vomiting is usually nothing to worry about. So how do you tell when vomiting is a cause for concern?

Chihuahua with mouth wide open, ears spread.
Matt Apps /

Your dog is most likely fine if they vomit once without any other symptoms, according to veterinarians. If your dog’s vomiting can be described as any of the following, then it is time to start getting concerned:

  • Continuous vomiting
  • Chronic vomiting
  • Vomiting a lot at one time
  • Vomiting with other symptoms, like fever, weight loss, lethargy, anemia, etc.
  • Vomiting blood
  • Vomiting with nothing coming up
  • Bloody diarrhea
  • Suspected foreign body ingestion
  • Seizures

It never hurts to play it safe when it comes to dog health. The best way to find out if your dog’s vomiting is normal or not is to call your vet.

What Causes Acute Vomiting in Dogs?

Acute vomiting, which can be defined as sudden or severe bouts of vomiting, is a serious symptom of quite a few diseases, disorders, and complications, including:

It is up to owners to help veterinarians narrow down the cause. For instance, if your dog vomits after being outside in the hot sun for a while or is trapped in a hot car, then heatstroke is a prime suspect. If your trash can displays evidence of canine exploration, then garbage, toxins, or a foreign body are more likely.

You know your dog’s behavior best, which is why it is up to you to fill your veterinarian in on anything that could have contributed to your dog’s condition, like access to human medications, toxins, a change in diet, and other possible causes.

If your dog is vomiting with diarrhea or vomiting with a poor appetite, call your veterinarian.

Chronic Dog Vomiting

Chronic, frequent, or long-term vomiting is also a cause for concern, especially if it is accompanied by the following symptoms:

As with acute vomiting, there are a number of conditions that can cause frequent or chronic vomiting:

  • Intestinal obstruction
  • Cancer
  • Parvovirus
  • Colitis
  • Constipation
  • Liver disease
  • Kidney or liver failure
  • Systemic illness
  • Intestinal inflammation
  • Pancreatitis
  • Uterine infection

Most of these conditions are very treatable, especially if they are addressed as soon as possible. The majority of the issues caused by chronic or frequent vomiting will not go away on their own and require the intervention of a veterinarian.

Vomiting in Puppies

A dog’s vomiting is potentially serious, but a puppy vomiting should always be treated as a potential emergency. After six weeks, puppies lose the immunity given to them by their mothers. Since young puppies only just begin receiving vaccinations, they are at an increased risk of contracting serious diseases like parvovirus or parasites. If your puppy is vomiting, don’t wait to see if it resolves on its own. Call your vet.

©Sergey Lavrentev -

Diagnosing Vomiting in Dogs

Determining the cause of a dog’s vomiting usually requires several steps. Your vet will ask you questions about your dog’s access to garbage, poisons, and toxins, about any recent dietary changes, and if your dog is exhibiting any other symptoms.

The vet will then perform a physical examination. If your vet feels it is necessary, they will run any additional tests, such as blood work, ultrasounds, X-rays, endoscopic evaluations, biopsies, and urine tests.

Treating Vomiting in Dogs

Once your vet determines the cause of your dog’s vomiting, they will tailor a treatment plan based on the cause and your dog’s condition. Vomiting itself can create issues like dehydration, electrolyte imbalances, and acid-based disorders. Your vet will address these problems by treating the symptoms and in some cases prescribing anti-nausea medications.

When Should You Call a Vet About a Vomiting Dog?

As humans, most of us don’t call the doctor over an isolated bout of vomiting. If your dog vomits once and then resumes their normal activities and eats and poops regularly, chances are it was a minor incident, although it never hurts to play it safe.

If your dog vomits more than once or has recurring bouts of vomiting, you need to call your vet immediately. Vomiting is a symptom of many serious diseases, illnesses, and complications, and as owners, we owe it to our dogs to take it seriously. Ignoring your dog’s vomiting could have serious (or even fatal) consequences.

This article is intended solely as general guidance, and does not constitute health or other professional advice. Individual situations and applicable laws vary by jurisdiction, and you are encouraged to obtain appropriate advice from qualified professionals in the applicable jurisdictions. We make no representations or warranties concerning any course of action taken by any person following or otherwise using the information offered or provided in this article, including any such information associated with and provided in connection with third-party products, and we will not be liable for any direct, indirect, consequential, special, exemplary or other damages that may result, including but not limited to economic loss, injury, illness or death.

Related article: Can Dogs Get Food Poisoning?