For example, female cats that are spayed before their first heat will have a reduced chance of mammary cancer, and will be unable to develop pyometra, which is a serious uterine condition that can cause death. (best-cat-art.com)
We feel it is best to have the spay procedure performed prior to the first heat cycle as this will markedly reduce future chances of mammary cancer development. (vetsaverspethospital.com)
Spaying reduces the stress and discomfort females endure during heat periods, eliminates the risk of uterine cancer, and greatly reduces the chance of mammary cancer. (bordercollierescue.org)