Mason swinging from the trees by his teeth.

Mason loves to play.  He has invented his own game.  It is obviously that enjoys swinging and he is pretty creative to have discovered how to do this. I have attempted to play tug with him, but he is not that interested in "just" tugging.  While watching him swing, I realized it was more the swing than the tugging that he seems to enjoy.  I have seen him hang on and use his hind legs to push off and start swinging again.  He is a one of a kind.