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Breed of long-haired sheepdog that has been used along the English-Scottish border for about 300 years. Usually black and white, it stands about 20 in. (50 cm) and weighs 30–50 lbs (14–23 kg). It is the most popular working sheepdog in the British Isles.
This entry comes from Encyclopædia Britannica Concise. For the full entry on border collie, visit Britannica.com.