CRYPTORCHIDISM:

One or both testicles failing to descend into the scrotum can be a problem in dogs. It is known to run in families. When both testicles remain in the abdomen, the higher temperature there prevents the production of sperm and the pet will be sterile. If one testicle does descend into the scrotum the pet should be fertile. These dogs can not be shown in AKC conformation and should not be used in a breeding program.

Retained testicles - Ron Hines DVM PhD

THE CASE FOR SPAYING/NEUTERING

Spaying or neutering will not change the basic personality of your dog but should make him or her more settled and focused. Neutering alone will not make your German Pinscher fat. Caloric needs may change, so you may need to adjust food amounts.

1. Males will often become more tolerant of other males, once they are neutered, and less inclined to roam. It also greatly reduces the tendency for males to mark inside the house. Neutering eliminates worries about testicular cancer or prostate disease.

2. Uterine infections or tumors of the reproductive system cannot develop in spayed females. There is also a decreased risk of mammary cancer.

3. Reputable breeders sell "pet" quality puppies with the agreement that the animal will be neutered or spayed. AKC provides limited registration papers to support this.

NOTE: The AKC permits spayed and neutered canines to participate in obedience, tracking, fieldwork, agility, and junior handling competition.