Brachycephalic obstructive airway syndrome (BOAS) causes significant breathing difficulties in flat-faced dog breeds, representing one of the most widespread welfare crises in companion animals.
BOAS represents a welfare crisis created by human aesthetic preferences. Dogs with severe BOAS cannot breathe freely during normal activity, play, or sleep — experiences that should be effortless are accompanied by chronic oxygen restriction and physical strain. Many dogs are chronically sleep-deprived because they repeatedly wake themselves struggling to breathe. Owners often normalize abnormal sounds and behaviors, unaware their dog is suffering. The surgical interventions that improve welfare are expensive and not always available. Breeding selection continues to push conformations toward more extreme flatness, worsening the problem with each generation. Regulatory momentum is growing: Norway banned French Bulldog and Cavalier breeding in 2023 under animal welfare law.