Cryptochidism: - This is to do with undescended testicles in unneutered male dogs. (pethelpful.com)
(Over 80 percent of unneutered male dogs develop some form of prostate disease.) (animalbehaviorcollege.com)
All problem or nuisance dogs should be sterilized because studies have shown that the majority of bite cases come from unneutered male dogs. (bestfriends.org)