In the movie, The Wizard of Oz, the adorable black Cairn Terrier canine actor, whose real name was Terry, played Toto. Terry appeared in many movies, The Wizard of Oz, being her most famous.

Dorothy and Toto on the set of The Wizard of Oz (1939)
After her immortal role as Toto, Terry appeared in a half-dozen other films.
In 1942, three years after The Wizard of Oz with Judy Garland, Terry’s name was officially changed to Toto.
Terry died in 1945 at the age of 13.
RIP