Selective breeding for extreme physical traits has created severe, heritable welfare problems in many popular dog breeds.
Breed-related health problems represent a systemic welfare failure in which commercial and aesthetic preferences have been placed above animal health outcomes. Dogs with heritable conformation disorders experience chronic pain, respiratory distress, and reduced quality of life from birth. The most fundamental reform is demand-side: buyers who choose health-prioritizing breeds, or mixed-breed dogs, reduce the market incentive for continued production of welfare-compromised conformations.