A review of medical records from 17 North American university veterinary medical teaching hospitals identified 66 dogs with hypospadias. Males predominated (15:1) and cryptorchidism was the most commonly diagnosed second anomaly, often associated with intersexuality. Fifteen cases, diagnosed at 10 different university hospitals, were Boston terriers, strongly suggesting that this breed has a familial predisposition for hypospadias. Male mongrels, as a group, were seen in approximately the same proportion as their representation in the hospital population, suggesting other components in the aetiology of the condition. If maternal histories are obtained as new cases are identified, a better understanding of the factors associated with the aetiology of the condition may be possible.
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