Good question. When you figure out what the best diet is, let me know.
I really don't think anybody knows. The only advice I have is to Google everything about dog food ever written. There are so many viewpoints and I am not sure who is right either. I am doing what makes sense to me now. We'll see how that goes. Every Yorkie is different and I am not sure that there is a perfect diet. I know, I'm not much help.