CAIRN TERRIER. Best known as "Toto" from the Wizard of Oz, the Cairn Terrier is a small, hardy working terrier. Originally bred to aid Scottish farmers in ridding their properties of pests, Cairns today use their tenacity to excel in obedience, agility, terrier and tracking trials. The Cairn Terrier originated in the Western Isles of Scotland, where, for centuries, he has been used as a working terrier, and was formerly known as he "Short-haired Skye Terrier."