I read in a yorkie book one time (I don't remember which one...) that although tug-of-war is an aggressive game, because of a yorkie's size it really isn't an issue. In fact the book said to go ahead and play!
My dogs love to play tug-of-war. They know it's a game between us and they are not aggessive toward me. I 'm not afraid of them over-powering me
I think I can take them...