What are spaying and neutering? Female pets have ovariohysterectomy, where their ovaries and uterus are removed which is called spaying. Male pets have their testicles removed which is called castration or neutering. Neutering and spay surgery have long-term advantages for your pet including benefiting their health, behavior, and helping with overpopulation. You can discuss with our veterinarian when the best time to spay or neuter your pet is depending on their age and breed.