Fertility: Cryptorchid dogs may have reduced fertility or be completely infertile. The testicles need to be at a lower temperature in the scrotum to produce viable sperm. When retained in the abdomen, the higher temperature inhibits sperm production and maturation.
Sperm quality: Even if a cryptorchid dog produces sperm, the quality and motility of the sperm may be compromised due to the abnormal environment within the abdomen. This can further reduce the chances of successful fertilization.
Breeding restrictions: In many countries and kennel clubs, cryptorchid dogs are not allowed to be used for breeding purposes due to the potential for passing on the genetic trait for cryptorchidism.
Therefore, while there is a slight possibility that a cryptorchid dog may produce some viable sperm, the chances are generally low, and the use of such dogs for breeding is strongly discouraged to prevent the propagation of this genetic condition.