A nine-year-old male Ibizan hound had a network of large tortuous puls
ating blood vessels on the prepuce that enlarged gradually over a five
month period, A diagnosis of arteriovenous fistula was based on clini
cal signs, angiography and Doppler ultrasonography, Ligation of the ma
jor vascular supply to the fistula resulted in only temporary improvem
ent. Definitive treatment was by wide excision, with penile amputation
and scrotal urethrostomy.