Canine Inflammatory Bowel Disease Study Guide

Overview and Clinical Importance

Inflammatory bowel disease (IBD) is a collective term for a group of chronic, idiopathic inflammatory disorders affecting the gastrointestinal tract of dogs. These conditions are characterized by persistent or recurrent gastrointestinal signs lasting more than 3 weeks, histologic evidence of mucosal inflammation, and exclusion of other identifiable causes. IBD represents one of the most common causes of chronic vomiting and diarrhea in dogs and is frequently tested on the NAVLE.

The pathogenesis involves complex interactions between genetic susceptibility, the intestinal microbiome, dietary antigens, and immune dysregulation. Current understanding suggests IBD results from loss of immunological tolerance to normal luminal antigens in genetically predisposed individuals.

Classification of Chronic Enteropathies

Modern terminology classifies canine chronic enteropathies (CE) based on response to treatment rather than solely on histopathology. This recognizes that histologic findings alone cannot reliably distinguish between different forms of CE.