haha what an astonishing feat. I wish I could train my dogs to do tricks like this, but Alas, I do not believe they have neither the patience nor the dexterity. My dogs are so clumsy, they will often run right into walls and or doors, not fully appreciating the extent of the impact that had been incurred. In fact, neither do they learn a lesson, rarely have they ever demonstrated any sort of restraint when it comes to playing and the velocity for which they then impact the wall or door. It is for this reason that I no longer play ball with my dogs, as they will always make the same clumsy mistake, it is for this reason that I do not believe that my dogs would be able to balance books on the head of the body attached.