Cairn Terrier originally descended from Scotland such as all the other terrier breeds, and this specific one was bred more than 200 years ago. You may recognize the Cairn Terrier as Toto from the movie, The Wizard of Oz. This breed is very intelligent and curious, but just like all the other terriers, it tends to be independent-minded, tough, but still a great watchdog. Cairn is the happiest when they can hang around their humans. Don’t leave your Cairn alone for a long time because he might become destructive. This breed has a high energy level, loves digging, chasing, and barking. Cairn Terriers love kids and are highly tolerant of them. With early socialization and training, they are very respectful of other animals. Cairn Terrier’s size is about 9 to 11 inches, and he weighs about 14 pounds.