The Cairn Terrier is a breed of dog of the terrier category. It is one of the oldest terriers, originating in the Scottish Highlands and recognized as one of Scotland's earliest working dogs, used for hunting burrowing prey among the cairns. Cairn Terriers are intelligent, strong, and loyal. Like most terriers, they are stubborn and strong-willed, and love to dig after real or imagined prey. The most famous Cairn Terrier is perhaps Toto from the film adaption of The Wizard of Oz. The Cairn Terrier has a harsh, weather-resistant outer coat that can be cream, wheaten, red, sandy, gray, or brindled in any of these colors.