Spaying and neutering are the respective surgical processes of female and male animal sterilization, to keep them from producing offspring. Neutering is sometimes used to refer to the surgery in either males or females. The process in males is also referred to as castration, or gelding.
Unlike in humans, sterilization in animals usually involves the outright removal of sexual organs. While many agree on the advantages of sterilization as a method of birth control, the necessity and humanity of spaying and neutering, as opposed to alternative methods of birth control, and the political agendas within the debate, are a subject of some controversy.
More on [ Spaying and neutering ]

Mouse Gazette: The Great Spay Debate - An article by Mary Ann Isaksen that examines studies, facts, and opinions.
SNiP: Spay/Neuter Information Program - Pasadena Humane Society offers information about why pets should be spayed or neutered, referrals, links, and descriptions of successful programs in other locales.
Meta Description: [ Spay or neuter your pet - its the healthy and humane choice if you care about your animals. Low cost spay/neuter services and vets, sterilization information and more ]
SPAY/USA - A nationwide network to provide affordable spay/neuter programs. Referrals, newsletter, articles, and advocacy.
Wolf Howl - Why I Wont Neuter My Companion - Extended arguments against spaying and neutering.
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