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Vomiting and diarrhea are the most common signs of gastrointestinal upset. There are many possible causes for these conditions, including viruses and parasites, something very simple like having eaten something bad, or something more complicated like cancer or organ problems (such as kidney failure). Ideally, treatment is aimed at the underlying problem, and can be as simple as temporarily withholding food or as complex as surgery or chemotherapy.
Loosely translated, the term gastroenteritis means an upset or inflamed stomach and intestines. As in people, gastroenteritis in pets can be caused by a multitude of underlying problems ranging from minor to serious and life threatening.
Vomiting usually indicates irritation in the stomach and upper small intestine, while diarrhea can mean irritation anywhere along the intestinal tract. But these are mere generalizations, of course.
You can tell a lot about the nature of the problem from the character of the vomiting or diarrhea. For example:
Because your pet can’t talk, your veterinarian counts on you for important information, like the signs noted above. Watch your pet’s gastrointestinal activity so you can describe the amount, frequency, and appearance of the vomiting or diarrhea. If possible, take a sample of the material to show your veterinarian. Your vet will also need to know whether your pet is drinking normal amounts of water, has a normal appetite, and is otherwise acting okay. After doing a physical exam, the vet may need to run some diagnostic tests. These may include:
Cases of mild vomiting and/or diarrhea typically respond well to TLC and basic home care. Withholding food for 24 hours to allow the gastrointestinal tract to rest may be recommended. If you have a young puppy or kitten or a pet that already has another medical problem, ask your veterinarian if it is safe to withhold food. If the signs resolve, your pet can then be started on small amounts of bland, highly digestible food, such as boiled chicken and rice, or a prescription intestinal diet. (See the entry on both vomiting and diarrhea as symptoms for more information on how this condition is best treated.)
If parasites are the problem, medication can generally be prescribed to treat the condition.
If gastroenteritis has been severe, long lasting, or accompanied by other signs of illness your vet may give fluids intravenously or under the skin to protect against dehydration. Medications are sometimes prescribed to calm the gastrointestinal tract and decrease the urge to vomit. In some cases, hospitalization for continued treatment and observation is recommended. If the underlying problem can’t be determined, your vet may recommend supportive treatment (like fluids and medications) to help your pet through the illness and give the body a chance to heal.
Unfortunately, not all cases of vomiting or diarrhea are simple and easy to treat. These conditions can sometimes be a sign of more serious problems, such as liver or kidney failure, diabetes, inflammation of the pancreas, severe viral infection, or allergic bowel disease. Some types of cancer can also cause vomiting and diarrhea, especially if a tumor pinches off the bowel and causes intestinal obstruction or damages the structures of the stomach or intestines.
Intestinal obstruction can be associated with intense pain, vomiting, and straining to defecate but passing only small amounts of runny stool, often with blood. This is a true emergency that requires immediate surgery to remove the blockage before the bowel ruptures or is irreparably damaged.
When in doubt, call your veterinarian if you notice vomiting or diarrhea in your pet.
This article has been reviewed by a Veterinarian.
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