Hi there,
I couldn't help but laugh while reading this! Aren't these little angels just the pickiest. My little one is 9.5 yrs old and I struggle too. We had a elevated kidney issue about 5 years ago, at that time I gave him science diet canned food (KD) and it worked! Then we found a chef here in our hometown that cooks for specific breeds with restrictions for whatever it is your Yorkie needs. I got their recipe and started cooking for him. I know you mentioned that you got a blood test and it was with flying colors; I'm so happy for your baby and you, with that said I would stick with, Boiled chix, spinach, brown rice, pumpkin, cranberries, blueberries. You can message me and I can send you some recipes, if this interest you
I hope your picky baby eats soon