What brand of food is good for my Yorkie?

I have a Yorkie that will be 1 year in a few weeks. I have been feeding her Royal Canin since she was about 4 months. She doesn't like it. We have to put a little bit of our Labrador's food in her's for her to eat it. But the problem is that the food we give our Labradors is Science Diet. My parents feed them that. I know that the Science Diet has by-product and I don't want to be feeding my Yorkie that, but she loves that food... I want a food that she will like and that will give her a silky coat. Any one have any suggestions?