This is not a very "nice" subject, but has anyone ever had a Corgi with a Perianal Fistula? My vet and I just discovered that mine has 2. My vet sees them all the time in Gernam Shepherds and several other breeds. When I had Gernam Shepheds and was showing them, I had several that had them over the course of time. My vet has been practicing for 30 years and is a "wonderful" diagnostician.