What causes perianal fistulas?
The exact cause of these fistulas is not known, but is thought to start as an inflammation of the sweat and sebaceous (oil) glands in and around the anus, followed by infection of the area. Abscesses form, open, and then drain. The warm, moist area around the anus and under the tail, and the large numbers of bacteria in the area, make an excellent environment for bacteria to multiply. What dogs are at risk for perianal fistulas? Perianal fistulas most commonly occur in middle-aged (5-8 years old) male dogs, but can occur in dogs as young as 1 year and as old as 14 years. German Shepherds are particularly prone to this disease, and in one study accounted for 84% of the dogs diagnosed. This may be due to the larger number of glands in the perianal area when compared to other breeds, or the way the tail is set and carried. German Shepherds are also more prone to immune-mediated diseases, which may be a component of this condition. Other breeds that have been reported as having perianal fi
