Just a thought...Awhile back, we bought my yorkie a new bag of the same food he had been eating for months, and he refused to eat the food from the new bag. He wanted nothing to do with it. So my husband and I decided something must be wrong with it, so we checked the bag for the expiration date. And the food had expired 2 months before!! Miko had sensed that the food was bad. We took it back and went to a different store and bought the same food. He ate it just fine.
Also, I agree with YorkieDaze, home cooking is definitely much better than dog food...You can't control what goes into dog food, but you can control what goes into your dogs bodies...As long as you have the time and you give them the right supplements, home cooking is the best route
You can make the food in batches and freeze what won't be used in the first few days. And you can take the food out of the freezer the night before
Good luck!!
If you don't have the time to home cook, there are many quality dog foods that you can check out here:
www.dogfoodanalysis.com The 4 and 5 star groups are best for yorkies. But with all these recalls, it's hard to recommend a good dog food.