Max all a quiver

Max loved having James around to play with and got him to play endless games of tug-a-war among others. At one point James was holding up one of Max's toys and trying to get him to jump up to get it. Max started to quiver his jaw like you might do if you were stuttering. It was hilarious to see, and of course everyone else tried to get Max to quiver his jaw as well. But he really only seemed to want to do this new trick for James. I will try to get him to do it again before he forgets this new ability. I wonder if a dog can stutter a bark. Happy travels.