Toto, the famous dog from "The Wizard of Oz," was a Cairn Terrier. The dog who played Toto in the 1939 film was a purebred Cairn Terrier named Terry. Cairn Terriers are small, energetic dogs originally from Scotland, known for their spirited and bold nature. Toto was a feisty, compact dog with a dense, weather-resistant coat, which made the Cairn Terrier breed easily recognizable in the role.