I posted this in another thread but just in case you missed it.
My dog has retained testicles - what does this mean?
During fetal development or shortly after birth, the testicles will descend into the scrotal sac. In some dogs, likely due to a genetic predisposition, the testicles may not descend into the scrotal sac. These dogs are known as either unilateral (one testicle) or bilateral (both testicles) cryptorchids. The testicle may be retained in the abdomen or anywhere between the abdominal cavity and the external sac. Retained testicles do not usually produce sperm, but they will produce hormones, which can lead to any of the behavioral changes or medical problems previously discussed. In fact, some studies have shown that retained testicles may be more prone to developing cancer. At the very least, it would be extremely difficult to determine if a testicle which is located in the abdomen, begins to develop cancer, since it cannot be palpated. All dogs with retained testicles should be neutered for medical and behavioral reasons, and to ensure that this genetic abnormality is not perpetuated.
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