Aren't they full of antics? The thing about yorkies is that you never know what they'll be into next!
I took Muffin out into the yard at night when she was a puppy and after awhile she started barking and carrying on. I looked over and there halfway under the fence was an oppossum frozen. I was scared to death she'd get in his face and get hurt or worse, but she was having such a fit and running back and forth in her yard that I couldn't catch her! I was finally able to grab her, but it took quite awhile. Yorkies will age you. I'm certain of it!