Dog spay and neuter procedures keep dogs from having unwanted puppies. You might think that you'll find homes for any puppies, but rehoming animals is harder than you expect. Many puppies become homeless or end up in shelters.
Dog spay and neuter surgeries also reduce behavior problems that occur when a female dog is in heat or a male dog seeks a mate. Spaying or neutering your dog also aids his or her physical health, preventing costly animal hospital expenses later in his or her life. According to the American Society for the Prevention of Cruelty to Animals, spaying a female dog helps prevent uterine infections and breast tumors. Neutering a male dog prevents testicular cancer.