Gastroenteritis in Dogs

Gastroenteritis is an irritation of the stomach and intestines; it usually results in vomiting and diarrhea. There are several causes of gastroenteritis: metabolic disorders, dietary indiscretion (this means ingesting inappropriate things, like garbage or the feces of other animals), inflammatory bowel disease, parasites, bacteria, viruses, or allergies can all cause vomiting and diarrhea.

One of the leading causes of gastroenteritis is feeding a pet “people” food or table scraps. An obstruction in the digestive tract can also trigger gastroenteritis, so a missing sock or favorite holiday ornament could also be the culprit.

“CollieRisk and Signs
All dogs and puppies are at risk for gastroenteritis, which can cause extreme vomiting and diarrhea, leading to dehydration and an electrolyte imbalance. Contact your veterinarian immediately if the vomiting and diarrhea persist.

In addition to vomiting and diarrhea, your pet may seem listless or depressed, and there may be blood in the stool or vomit.

Because there are so many causes of gastroenteritis, be sure to provide your veterinarian with a thorough history of your dog, including answers to the following questions:

  • Symptoms?
  • Travel history?
  • Exposure to other dogs?
  • Unsupervised access to your yard?
  • Leashed on walks?
  • Changes in dog food?
  • Ingestion of foreign objects?
  • Ingestion of garbage or people food?
  • If your veterinarian suspects gastroenteritis, they will want to identify the underlying cause. 

In order to do this, they may recommend a combination of the following tests:

  • Chemistry tests to evaluate for kidney, liver and pancreatic function as well as sugar levels
  • A complete blood count to evaluate inflammation, infection, anemia, and other blood-related conditions
  • Electrolyte tests to ensure your dog is neither dehydrated nor suffering from an electrolyte imbalance
  • X-rays of the abdomen to evaluate for foreign material and/or obstruction of the gastrointestinal tract 
  • Ultrasound imaging of your dog’s digestive tract and other major abdominal organs
  • An endoscopy to evaluate the lining of the stomach and intestinal tract
  • Specific tests to rule out viral infections, such as parvovirus
  • Fecal tests to identify if fecal parasites could be the cause
  • Special fecal tests, such as cultures and polymerase chain reaction (PCR) testing

Dogs with gastroenteritis, regardless of the cause, are often dehydrated and sometimes need to be given fluids under the skin (subcutaneously) or directly into a vein (intravenously). Depending on the severity, your dog may be hospitalized to get the diarrhea and vomiting under control. In less severe cases, your veterinarian may give you medications and instructions regarding how to care for your pet at home. It is very important that you follow the treatment instructions from your veterinarian carefully to reduce the chance of the diarrhea recurring.

Some of the best ways to keep your dog healthy are to watch what he eats, keep him or her free of parasites with monthly preventatives, keep vaccinations current and submit your dog's fecal samples to your veterinarian. Keeping your dog away from trash and other unfamiliar items, such as people food, and restricting your dog's contact with potentially sick dogs in public places, like the park and boarding facilities, will also protect her from becoming sick.

If you have any questions or concerns, you should always visit or call your veterinarian – they are your best resource to ensure the health and well-being of your pets.



See more about common dog stomach and 

gastrointestinal ailments

Does Your Dog Have An Appetite for Life? Foreign Body Obstruction in Dogs 

Inflammatory Bowel Disease in Dogs

Intestinal Parasites and Dogs A-Z

What "People Foods" Can Dogs Have? 

Colitis in Dogs 

Related symptoms: 
Reviewed on: 
Monday, April 7, 2014