Wow! I was so freaking out when I read that. My Yorkie has a metal crate that is big enough for a boxer to fit in, so I am trying to picture my little 7 lb guy dragging his crate anywhere.... Luckily I saw the picture and realized it was my cat's crate your Yorkie was dragging around and I felt so much better.
Poor little guy, I hope he is okay. I can only imagine how upset he was about that.
Teek says he hopes his head doesn't hurt after that.