Spaying a female dog eliminates the possibility of uterine or ovarian cancer and greatly reduces the chances of breast cancer. Altered pets are more affectionate and loving companions. Spaying a female dog will eliminate the mess of having her go through heat two times a year. Spaying a female cat will end the constant crying. Stud dogs and Toms will no longer visit if your female is spayed.
Unaltered pets tend to exhibit behavior and temperament problems.
Unaltered male cats tend to spray, run away, get into fights, and roam the neighborhood. Communities spend a small fortune to control and eliminate unwanted animals. Animal control has to pickup animals that are hurt or dead on the road. Shelters have the sad task of killing unwanted animals. A male dog or cat is neutered by removing both testicles.