Is it okay for a dog to have only one testicle? A dog with only one testicle means that the dog is cryptorchid. Cryptorchidism is when a male dog’s scrotum reaches six months of age and is missing one or both testicles. The testicles may remain in the abdomen or may never develop. Dogs with cryptorchidism symptoms can have problems such as aggression or low mood, and dogs with retained testicles have a ten times higher risk of testicular infections and cancer than dogs without retained testicles. For dogs with cryptorchidism, neutering is the best treatment. Removal of the testicles is done to prevent the subsequent risk of preserving the testicles and to prevent the development of testicular cancer.
