Spaying and neutering companion animals prevents overpopulation, reduces individual disease risks, and has behavioral benefits, though optimal timing is subject to ongoing research.
Spay-neuter programs are among the highest-impact welfare interventions available given their role in preventing the overpopulation crisis that results in millions of companion animal deaths annually. For individual animals, the health benefits in terms of cancer prevention and elimination of reproductive diseases are substantial. The timing debate for large breed dogs reflects genuine science around musculoskeletal development, and individualized timing discussions with veterinarians lead to best individual outcomes.