Normal. Running around thrashing a road cone and it hits you in the back of the knee, normal level: Otto.
I'm a little concerned since the pup is 6 weeks. That's the age where they should be learning give and take in play, testing limits with their litter mates. Careful what his play agressive experiences are for the next few weeks!
Venus of Crooked Creek 1/26/13
Otto von Hena-C 05/23/08
Morgan Donnermond 08/04/01 to 9/28/12 Long Live the Queen!
I have duct tape and I am not afraid to use it.