Spank a dog??? - NEVER - be it big or small. I can't even imagine anyone spanking a tiny Yorkie!!! A firm tone in your voice will accomplish more than a firm hand!

I have on a few occasions given Sparky a light swat on the backside with a fly swatter and that got his attention. He seems to have developed "selective hearing" when he is outside and decides that he doesn't want to come in when I call him. Just a few times doing that, and his hearing miraculously improved. Now whenever he decides he doesn't want to come in when I call him, I walk outside with the flyswatter in hand, and he comes running!