Spaying or neutering a pet is an important preventive health measure as well as a means of limiting the number of homeless pets, writes veterinarian Ann Hohenhaus, who notes the AVMA's Guidelines for Responsible Pet Ownership encourage owners to help keep the pet population under control. During a neuter operation, a veterinarian removes a male dog's testicles, the main source of reproduction and testosterone, thereby preventing the dog from siring puppies and protecting it from testosterone-related problems including behavior issues and health threats such as prostate cancer, Dr. Hohenhaus points out.

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