Colitis in Dogs

Section: Overview

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Colitis is an inflammation of the colon, or large intestine. It may be acute, with sudden onset and short duration, or chronic, that is present for at least two to three weeks or exhibiting a pattern of episodic recurrence.

There are many potential causes of colitis. These include:

Antibiotic-associated colitis

There is no age or gender association with colitis. One exception is histiocytic ulcerative colitis, which most often affects young boxer dogs.

Most often, colitis causes some combination of fresh bright red blood in the stool, mucus in the stool, straining to defecate, and increased frequency of defecation, often many times per day. With acute colitis, the dog usually does not show signs of systemic illness, but dogs with chronic colitis can experience clinically important weight loss.

What To Watch For

An occasional bout of acute colitis is not uncommon in the small animal patient. However, it is important to watch for frequent recurrence or worsening of signs, especially if they include systemic signs of illness. Although occasional vomiting occurs in otherwise healthy dogs, repeated vomiting, poor appetite, weight loss and general lethargy should be reported promptly to your veterinarian.

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