1. Your pet is likely to live longer. Neutering eliminates the risk of testicular cancer and other testicular diseases, and reduces the incidence of prostate disease and hernias. Spaying eliminates the risk of uterine cancer, Pyometra (a life-threatening uterine disease), and uterine infections. If you spay your female dog before her first heat, her changes of getting breast cancer are practically zero. She also will never be at risk for the complications associated with pregnancy and giving birth.
2. You'll be helping reduce overpopulation. If you think you're sure to find homes for all the adorable puppies from your dog, think twice. Millions of unwanted dogs are euthanized each year, and for every dog reclaimed or adopted from a shelter, there are already two or three waiting for a home. Why add to those numbers?
Think just one litter won't hurt? Here's another mind-boggling statistic: In six years, one dog and her puppies can produce 67,000 puppies. Unless you are a committed, accredited breeder, spaying or neutering your dog is the only sensible option. If you want to work with a breeder to mate your purebred dog, make sure you keep the animal out of situations where an accidental pregnancy could occur.
3. You'll have a stay-at-home dog. Spayed and neutered animals are not seeking a mate, so they have less of an urge to roam. They are happy to stay close to home and avoid cars, fighting dogs, and contagious diseases.
4. Your dog will be more sociable. A dog's natural affection for the people around him can get sidetracked by his reproductive urges. Without the distractions of finding a mate, your dog is free to focus his love and attention on you and your family. Spayed or neutered animals can be less aggressive, which allows them to get along better with the people and other animals they live with.
Some dog owners take this to mean that their dog's protective instincts will be affected by neutering. The fact is that heredity, personality, and training are what make your dog a good family companion. Protecting the rest of his "pack" is an instinct unaffected by the reproduction cycle.
5. You may not have to buy as much dog food. Due to hormonal changes, dogs often need a smaller caloric intake after spaying or neutering. If you continue to feed your dog the same amount she was eating before she was spayed, she will likely become obese. If you feed your dog a smaller portion and exercise her regularly, she will retain her healthy form.
You may hear someone attribute a reduction in a dog's activity level to spaying and neutering. It is more likely that the puppy is merely maturing, and the changes in his eating and sleeping patterns reflect that.
6. It's worth the expense. Consider the alternatives, like paying for health care expenses from the diseases you could have avoided if you had spayed or neutered your dog; paying for puppy care; and paying health care costs related to roaming, like wounds and infections from dog fights or broken bones and lacerations from car accidents. In some areas, annual animal license fees for neutered pets are reduced. Do the math.