Veterinarians Charlie Meynier and Jim Stortz write that spaying female dogs and cats reduces the incidence of mammary cancer, eliminates uterine and ovarian cancer risk and prevents pyometra, a potentially life-threatening infection of the uterus. Neutering male animals protects them from prostatic hypertrophy and infections, as well as testicular cancer and certain types of hernias. Drs. Meynier and Stortz also note that many less desirable animal behaviors are usually reduced by spaying or neutering, including roaming and territorial aggression.
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