Thompson doesn't have much trouble keeping up with Diego or Theo when they are going full speed. His balance is much better when he is running. He struggles however when he is moseying along. Sometimes if he is moving really slow, he'll move forward by dipping his whole left front side down and pushing himself forward with his back legs. When he is trying to thwart an attack by Theo, Thompson will often resort to backing up or even standing on his hind legs.
None of this seems to phase him though. One of my all time favorite sights in this world is the sight of Thompson running towards me with his determination fully expressed in each and every step he takes.