Selective breeding for extreme physical traits has created serious chronic health and welfare problems in many popular dog and cat breeds, representing a preventable welfare crisis at scale.
Breeding animals for physical extremes that compromise their fundamental health functions represents a systematic, ongoing welfare harm affecting millions of animals annually. A bulldog that cannot breathe normally, a Persian cat with eyes that cannot be fully closed, or a dog with a spine so long it invariably develops disc disease — these are not accidents but the predictable outcomes of breeding priorities that placed appearance above health. Reform requires changes in breed standards, breeder practices, veterinary guidance, and consumer demand. The welfare improvement possible through selecting for functional anatomy over extreme appearance is substantial.