Just a friendly suggestion, I would not get the smallest yorkie I could find. Most every yorkie is pretty darn small anyway. But the itty bitty ones are sooooo easy so damage and hurt, plus I believe its easier for them to have health problems. Have you considered checking with yorkie rescue. I am sure you can find a very loving and grateful baby that will be pretty inexpensive. I am sure if you rescue one, everyone on this board will think you a hero.
