Brachycephalic obstructive airway syndrome affects flat-faced dog breeds and represents one of the most serious breeding-related welfare crises in companion animal veterinary medicine.
BOAS represents a systematic welfare failure built into the genetics of millions of dogs. Affected animals spend every waking moment breathing through compromised airways, experiencing what is effectively chronic partial suffocation during exertion or heat. Sleep is disrupted by airway collapse, creating chronic sleep deprivation. The condition worsens with weight gain and heat, limiting exercise and normal dog activities. What makes this welfare crisis particularly troubling is that it was deliberately created through breed standards prioritizing appearance over health, and continues to be perpetuated by consumer demand for flat-faced dogs. Reform requires changes in breed standards, breeding regulations, and buyer education simultaneously.