Many dogs with perianal fistulas also have inflammatory bowel disease, a disease also due to an overly aggressive immune system. (1800petmeds.com)
Odin my 4 year developed Perianal Fistulas when He was 3 years of age. (consumersadvocate.org)
Treatment of perianal fistulas with human embryonic stem cell - derived mesenchymal cells: a canine model of human fistualizing Crohn's disease. (cuvs.org)