What Are the Causes of Perianal Fistulas in Dogs?
Perianal Fistulas (PF) are lesions in the skin and deeper tissues surrounding a dog's anus. Though the condition is found in all breeds, German shepherds and Irish setters are much more susceptible to this painful condition. Veterinarians suspect a number of contributing causes of PF.
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Genetics
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Heavy line breeding and inbreeding may cause PF.
Broad-Based Tail Theory
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When the tail is carried low between the hipbones, completely covering the anus---as with German shepherd tail carriage---the resultant bacteria-rich environment may lead to PF.
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Diarrhea
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Chronic diarrhea caused by diseases such as irritable bowel syndrome may be a contributing factor to PF.
Immune System
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It is theorized that problems with the dog's immune system may cause PF. A 1997 study showed positive results when dogs with PF were treated with immunosuppressive drugs. (Mathews, et al, "Randomized Controlled Trial of Cyclosporine for Treatment of Perianal Fistulas in Dogs," JAVMA, 211 (10), Nov. 15, 1997)
Obstruction or Infection
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Obstruction or infection of the dog's anal sacs or hair follicles may lead to PF.
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References
Resources
- Photo Credit Image by Fotolia.com, courtesy of wrangler
