I know Yorkies are bred to be Mousers, but I had to share this and to see if anyone else's yorkies do this...
Mandie cannot stand when I'm at the computer desk at the computer. She will yell at me and jump and hit my thigh over and over until I finally pick her up. When I pick her up, I set her between me and the keyboard. This is when the fun begins...
When I move the mouse around on the screen (the arrow or hand..either will do for her), she follows it on the screen like she's on the prowl. Then, all of the sudden, she will lunge at the monitor and try to bite the mouse on the screen.
For her...she doesn't care if it's a living mouse or a computer mouse, I guess. LOL! She just cracks me up