Glimpse of the Dream Cycle

I was sitting in a chair with my hands gripping the arm rests. A LARGE German Shepard was sitting to my left and being a pretty good dog. We were both watching something far in front of us when I noticed the dog began chewing/gnawing on the knuckles of my left hand. I could feel the biting but felt no pain. I even felt the teeth of the dog scraping against the bones in my hand and fingers. I wasn't freaked out or terrified in any way... more just ponderous as to why the dog suddenly decided to eat my left hand.