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Atresia Ani in the Dog: A Retrospective Study

From the Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, Tennessee 37996-4546.

Congenital anomalies of the rectum and anus are rare in dogs. The most frequently reported anomaly is atresia ani. Four types of atresia ani have been reported, including congenital anal stenosis (Type I); imperforate anus alone (Type II) or combined with more cranial termination of the rectum as a blind pouch (Type III); and discontinuity of the proximal rectum with normal anal and terminal rectal development (Type IV). An increased incidence was found in females and in several breeds, including miniature or toy poodles and Boston terriers. Surgical repair is the treatment of choice, but postoperative complications can occur, including fecal incontinence and colonic atony secondary to prolonged preoperative distension.

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				C. B. Webb, K. W. McCord, and D. C. Twedt Rectal Strictures in 19 Dogs: 1997 2005 J. Am. Anim. Hosp. Assoc., November 1, 2007; 43(6): 332 - 336. [Abstract] [Full Text] [PDF]