Dogs live happier and healthier lives when they are spayed or neutered. For example, spaying of dogs, which is for female dogs,  before they are six months old eliminate the risk of uterine and ovarian cancer and greatly reduces the chance of breast cancer. For male dogs, neutering eliminates testicular cancer and decreased the chance of your male dog getting prostate problems. Additionally, positive behavioral changes take place in altered animals, as they are more docile and gentle. For example, male dogs will be less aggressive and less like to runaway if they are neutered. Altering your dog  also makes life more convenient for pet owners as it eliminates blood on floors, the need to board dogs during their heat cycles, and it eliminates the burden of breeding your dogs. Also, it may cut down on inappropriate sexual behavior. Perhaps the most important reason for neutering or spaying your animal is that is helps reduce  the pet population.