Mutt

&nbsp Mutt is Mimi 's little dog.

Wherever Mimi goes, the dog goes.

When Mimi and Leo first break the rules of Music Box world,

the Blue Queen appears and tries to convince Leo and Mimi that the key is a ring.

Before leaving, the Blue Queen snatches Mutt and takes him into the world of Rondo.

In The Key to Rondo, Leo and Mimi plunge into the world of the music box trying to track down the Queen and retreive Mutt.

Mutt is a small Yorkshire Terrier