I agree with Nancy1999 and Maximo.
Almost everything I find about raw feeding and home cooked diets are geared toward large breeds. I have found very little on this subject geared toward Yorkies in comparison to large breeds (at least not enough to get me to jump without fear). Even the threat here in YT about it is slim. That makes me even more careful about making a swift decision about my babies diet.
I've been on this roller coaster for about 2 years, reading, asking, Googling, you name it. And I still haven't found my way into a better nutrition for my fur-kids
Not because the advice you get here by YTers in not great and well intentioned, but because Yorkies are different, special, delicate and so worth turning every stone.