Aberrant migration of Ancylostoma caninum to the os penis of a dog.

A male pitbull terrier was presented with a history of stranguria and depression. On clinical and radiological examination a suspected necrogranuloma of the caudal os penis, which obstructed the urethra, was found. The necrogranuloma was removed surgically and contained blood and necrotic tissue as well as several adult male and female Ancylostoma caninum worms. The urethral obstruction resulted in post-renal azotaemia, hydronephrosis and eventually bladder rupture. A rare case of aberrant migration of A. caninum to the os penis of a dog is described.