I like big dogs, but I can't stand the constant smell and drool and ick... Yorkies are small and adorable, they don't drool incessantly and I can hold her on my lap!
That's the biggest thing of all. That and I know that she will love me unconditionally, no matter if I go out without her, or if I am unhappy or whatever. She will just come up and lick me and hug me, she always makes me smile...