They are also more calm and less aggressive and more content family members. It costs less to license pets if they are spayed or neutered, and licensing is required by law. You will also probably save in veterinary costs, because neutered and spayed animals are generally healthier and less likely to roam and be injured or contact various diseases. Neutering a male tom cat has proven to add many years to his life. Having puppies and kittens is stressful on some animals, especially if they're too young or haven't been well cared for.
Some new mothers get very sick and even refuse to eat the whole time they're nursing.
Some die when the litters are born. Others get life-threatening infections if they're bred too many times. Veterinarians perform many of these procedures every day. With proper care and rest, your pet will be up and bouncing around again in two to three days. If just one person would be responsible and spay one dog or one cat, the result would be to save thousands of lives, by preventing the births of animals that will never have to suffer or be put to death just for lack of a home.