Selective breeding for specific traits has created dramatic differences in lifespan across dog breeds, with some living twice as long as others, raising important welfare questions about breeding practices.
Shortened lifespan in dogs is not a neutral variation — it represents years of potential life denied, often accompanied by significant disease burden in the final years. Dogs bred for exaggerated traits frequently experience health problems from birth onwards. The welfare impact extends across the entire lifespan: a Great Dane may experience joint pain, bloat risk, and heart disease throughout its brief life. Responsible breeding programs that prioritize health over conformance to show standards can meaningfully extend both lifespan and quality of life. Genetic testing before breeding can eliminate many inherited disorders.