Gracie Ruth & Yogi both love theirs, but word of caution - if your Yorkie is on the smaller side, their heads can get stuck in the trunk part of the toy.
No harm done as they can still get plenty of air, but they do bump and bang around trying to get it off. And although it is a bit comical watching your baby walking around with a tree trunk on it's head, I can't imagine it's a lot of fun for said trapped baby.
So now they only get to play with the toy under supervision.