drainage

Perianal fistulas or anal furunculosis is a chronic, progressive disease characterized by ulceration of the perianal tissue (tissue surrounding the anus) in the dog. The clinical signs of perianal fistulas may be present for years, gradually worsening over time. A fistula is defined as an abnormal passage or communication between an internal organ and the surface of the body or between two organs, and it is typically seen as multiple draining tracts, in this case surrounding the rectum.