My Keyra loves Cesar and Fromm Gold. The fromm is really good cuz it comes in different flavors so you can change it up so your yorkie doesn't get bored. Mine is on fromm gold puppy (chicken duck and eggs). The ingredients list is really great. Ask some pet stores if they have samples. The store I buy mine give out small sealed sample bags of each flavor so you can try it out on your dog and see what they like. I think its great

and Cesar she goes nuts for. Lol what can I do

none the less my Keyra gets lots of different things. I give her apples, pears, carrots she loves to death and watermelon and I buy good healthy treats that carry a lot of vitamins that will help her so I make up for what she doesn't get at one time

Hope I could help but I think you can ask for samples of fromm and see how it works. Ask for 4 star and 5 star fromm