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"More information: https://www.vet.cam.ac.uk/boas/about-... The French bulldog, bulldog, pug, pekingese, shih tzu, Japanese chin, boxer and Boston terrier are all examples of brachycephalic breeds. The most distinctive feature of these breeds is their short muzzle. Brachycephalic dogs have been bred for centuries to possess a normal-sized lower jaw, and a disproportionately shorter upper jaw. In recent decades, breeding selection for extreme brachycephalic features has resulted in dogs that are predisposed to upper airway tract obstruction and subsequent respiratory distress, among severa