Arrowhead indicates ovarian tissue with follicles developing on the external surface of the ovotestis. C. Higher power magnification of the testis portion of the ovotestis. When only testes are found, they are usually in the abdomen. All affected dogs have a complete uterus. Many have an epididymis adjacent to the ovotestis or testis.
Double arrows indicate the uterine horns.
Single arrow indicates an epididymis adjacent to an ovotestis. The Sry gene is normally located only on the Y chromosome. Both normal and affected dogs have the control product from the HPRT gene, which is on the X chromosome. At present, correct diagnosis of affected dogs is difficult, and there is no practical method to identify carriers . We hope to increase breeders' awareness of XXSR by describing the common findings in affected dogs.