Dog Castration

What does dog castration imply? Will his temper change? In some circumstances, owners are advised to castrate their dogs as a way to restrain some conduct problems, specially the wanderer. Several studies suggest that around 90% of dogs are less willing to wander after castration, and restricts its sexual behavior. Nevertheless, this surgery may not dishearten a dog to mate, if he was already experiencing it before. Some other sexual conduct problems, like the uncontrollable odor marks with urine around the house, can also be solved with surgery. Castrating a young dog is simple, especially when he is reaching sexual maturity, but it's irreversible, because both testicles are extirpated with a cut in the scrotum. 
I think my dog only has one testicle