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Border Collie - Wikipedia
Border collie | Description, Temperament, & Facts | Britannica
Border Collie Dog Breed Information - American Kennel Club
边境牧羊犬 - 维基百科,自由的百科全书
Border Collie: Dog Breed Characteristics & Care - The Spruce Pets
边境牧羊犬 - 维基百科,自由的百科全书
Border Collie Breed Facts, Personality & More - Rover.com
Border Collie Dog Breed Information & Characteristics - DogTime
Border Collie Dog Breed Information & Characteristics - Daily Paws
Border Collie Dog Breed Profile: Temperament Characteristics