Tap me on my fingers im bad bad bad ... i don't discipline my yorkies, maybe im doing it very wrong, but the method i use on them works like a charm for us, i think if i had to yell or be firm to them my husband will think i fallen off a rock
When they do something they not suppose to i call their names to distract them and tell them to "come here". I think if they really did something that just can't cross the line i would tell them "NOOOOOOooooo"