If you can believe it, Uma is the one that will pull Wally along even though he's got 10lbs on her. He seems to love being dragged and Uma's got a very strong mouth.
Ahhh there's another one! Bisou does the same exact thing. Any time we or Shasta are playing tug with her, she just throws herself on the floor and won't move, expecting to be dragged. It's so funny! Way to go Bitty, what a tough cookie!