Penile hypoplasia in a rottweiller: a case report

GOBELLO C.; DELUCA, J.C.; CORRADA Y.; GARCIA M.; PERAL-GARCIA, P

ANALECTA VETERINARIA

FCV-UNLP

Lugar: La Plata; Año: 2003 vol. 23 p. 38 - 41

Penile hypoplasia is a rare congenital disorder that has been described in a few breeds of dogs. The aim of this article was to report a case of penile hypoplasia in an inbred Rottweiler dog. An otherwise healthy, 3 years old Rottweiler male dog, was referred to our Faculty because of inability to copulate. The male had a history of normal libido. Testis appeared normal either in size and consistency, while the penis and prepuce were small in relation to the size of the dog. Manual semen collection was impossible due to the small size of external  genitalia and the aggressiveness of the dog. Serum testosterone concentrations were 1.63 and 3.35 ng/ml before and after hCG stimulation test. Cytogenetic analysis showed a normal male karyotype. The modal chromosome number was 78 and the sex chromosome constitution was XY. Pedigree analysis showed that the dog was full sib. F Wright inbreeding coefficient was 0.25. This coefficient showed that there is a 25 % probability that this dog shares their genes with a common ancestor. As a preventive measure, consanguineous matting should always be discouraged. Moreover, knowing that congenital malformation is heritable, the importance to eliminate affected dogs from natural or assisted reproductive programs should also be emphasized by practitioners.