Causes of Vomiting in Dogs: Why Is My Dog Throwing Up?

Vomiting is only a symptom, not a disease in itself. 

There are many different diseases and disease processes that can cause vomiting in dogs. When your dog is vomiting persistently or severely, successful treatment relies on finding the cause.

Causes of Vomiting in Dogs: Why Is My Dog Throwing Up?

Gastrointestinal causes of vomiting in dogs

Many diseases affecting the gastrointestinal (GI) tract can cause your dog to vomit. These diseases range from mild and self-limiting in their nature to life-threatening.

Accompanying symptoms might include:

  • diarrhea
  • lack of appetite
  • dehydration,
  • and more depending on the individual disease and severity of the illness
Commonly encountered causes of GI vomiting include:
  • dietary indiscretion (also sometimes known as “garbage can enteritis”)
  • food intolerance/food allergies
  • parasites (roundworms, hookworms, Giardia, coccidia, etc.)
  • viral infections (canine parvovirus, coronavirus, canine distemper, etc.)
  • bacterial infections (Salmonella, E. coli, etc.)
  • foreign bodies
  • intestinal obstruction
  • intussusception (telescoping of the intestines which causes a functional obstruction)
  • tumors/growths in the GI tract

Non-GI causes of canine vomiting

It is easy to assume that vomiting is due to gastrointestinal disease. However, this is not always the case. Systemic diseases can also cause vomiting, often as a result of toxins which build up in the bloodstream.

There is a relatively long list of systemic diseases that can potentially cause vomiting. While there is not room here to list all of them, these are some of the most common:

  • kidney disease/kidney failure
  • liver disease/liver failure
  • pancreatitis (inflammation of the pancreas)
  • pyometra (infection of the uterus)
  • diabetes mellitus
  • Addison’s disease (a disease of the adrenal gland)
  • toxins/poisons

Diagnosing Vomiting in Dogs

In cases of mild vomiting, absolute diagnosis may not be necessary as the disease may be self-limiting. Under those circumstances, fasting for a few hours followed by a bland diet may be all that is necessary for recovery.

However, if vomiting is severe and frequent or accompanied by other serious symptoms, pursuing an accurate diagnosis will be necessary.

When in doubt about the seriousness of your dog’s illness, seek veterinary help sooner rather than later.

The basic diagnostic approach for vomiting is likely to include one or more of the following:

  • fecal examination, checking for parasites and ova (eggs) of parasites
  • a Giardia Elisa test on the feces
  • a basic blood screen consisting of a complete blood count and blood chemistry profile, including blood electrolyte measurement
  • abdominal radiographs (x-rays) and/or an abdominal ultrasound

Additional testing may or may not be necessary, depending on the results of these tests.

Related articles:
My Dog’s Vomiting: Why Is My Dog Throwing up?
Severe Vomiting in Dogs: What Happens in a Dog’s Body with Severe Vomiting?

Further reading:
Different Types of Dog Vomit, and What They Indicate

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