Haha! Yuki thinks he is a dog too. Follows me around constantly, and looooves to go for walks on a harness. He'll maow his head off if you show him his harness, wanting to go out.
http://www.nutkitty.com/yukiwalk.html
...and here are a few more pics, since he is so photogenic. :P
(he looks like he is playing dead in one of them, haha!)
Thanks for your comments, guys. I'll definitely overwhelm you all with yorkie pics when I finally get one!