Flat-faced dog breeds including French bulldogs and pugs suffer chronic breathing difficulties, eye problems and spinal issues as a direct result of selective breeding.
Brachycephalic dogs often live their entire lives in respiratory distress that their owners perceive as normal snoring. The chronic effort of breathing through narrowed airways causes sleep disruption, exercise intolerance and heat vulnerability. Spinal malformation (hemivertebrae) causes chronic pain and paralysis in severely affected individuals. The welfare cost of popularity-driven breeding for extreme traits is borne entirely by the animals.