Dog who traveled with Dorothy, the Scarecrow, the Tin Man and the Cowardly Lion (4)

I believe the answer is:

toto

(Other definitions for toto that I've seen before include "[FRIEND OF DOROTHY]" , "Famous film dog" , "Dorothy's dog in The Wizard of Oz" , "member of the 5d band" .)

I've seen this clue in The Washington Post.

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