The Cairn Terrier is considered to be one of the oldest terrier breeds. They originated in the Scottish Highlands and the Isle of Skye. Cairn Terriers were originally lumped in with theScottish Terrierand theWest Highland White Terrieras one breed.
However, in the 1900s the three began to be bred separately and individual breeds were developed. The Cairn Terrier's principal duty is that of a ratter. They were utilized by farmers to catch and kill mice, squirrels and other rodents. The Cairn Terrier was originally known as the Short-haired Skye Terrier until they were brought to the United Kingdom's dog show in 1909.
By the turn of the 20th century, Britain’s terrier fanciers had sorted out the various Scotch earthdogs and began breeding Cairn, Scottish, Skye, and West Highland White terriers as distinct pure breeds. Cairns were exhibited at British dog shows of the era, and the AKC recognized the breed in 1913.
The breed’s public profile received a tremendous boost in 1939, when a Cairn named Terry was chosen to play Toto in MGM’s production of “The Wizard of Oz.”