I'm sorry to hear your Yorkie isn't feeling so well

. My Tucker went through a liver shunt ordeal, and was put on many differenct science diets, like S/D, C/D, and U/D. We found that he really likes to eat pieces of crushed ice (odd I know) and even though it might call for some extra teeth brushing, we give him lil pieces of peppermint. These treats have worked for Tucker, but you might want to check with your vet. Hope he gets to feeling better soon!!!!