Jeff and I were working on the back deck. When I closed the sliding door which leads into the house , I left it open a few inches. Otis could stick his nose outside, but that was it.
I thought that I must have left the door open more than I thought. I ushered Otis back inside and again pulled the door mostly shut.
A few seconds later, Otis was back on the deck.
I then realized that Otis stuck his head into the small opening in the door and pushed, until the door was open wide enough to walk through. I never thought that Otis would be smart enough or strong enough to do this.