They are often cited as the most intelligent of all domestic dogs. Border collies continue to be employed in their traditional work of herding livestock throughout the world and are kept as pets. While black and white is the most commonly seen color pattern of the Border Collie, the breed appears in just about any color and pattern known to occur in dogs. While black and white is the most commonly seen color pattern of the Border Collie, the breed appears in just about any color and pattern known to occur in dogs. Some of these include black tricolor (black/tan/white), liver and white, and red tricolor (red/tan/white) which have also been seen regularly, and other colours such as blue, lilac, red merle, blue merle, brindle, and Australian red (also known as ee red, blonde, recessive red, or gold) which is seen less frequently. Some border collies may also have single-color coats.Eye color varies from brown to blue, and occasionally eyes of differing color occur; this is usually seen with merles.
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