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Skull shape variation in the dog. Above are shown extreme examples of brachycephalic breeds (on top, from left to right: Pug, Japanese Chin, Brussels Griffon, French Bulldog, Neapolitan Mastiff) and dolichocephalic breeds (on bottom, from left to right: German Shepherd Dog, Bull Terrier, Saluki, Ibizan Hound, Collie) (images: Mary Bloom, AKC).
