Anal furunculosis (perianal fistulas)
Anal furunculosis (also called perianal fistulas) is a distressing condition commonly affecting German Shepherd dogs and occasionally other breeds. The problem is one of chronic deep infection, inflammation, discharges and ulceration around the tail base and anus. The condition may progress to involve a large area around the back end of the dog. It can be very difficult to cure or control but recent advances in treatments are proving encouraging.