Yeah, that happens a lot - they pick out the new stuff. Mix it in as best you can - if their poos are fine after a few days, most people just switch over to the new food. By the way, Royal Canin does have corn and fillers in it - so it can be quite a tough food for many yorkies and has caused allergies in a lot of yorkies here. So, after this bag - you *may* want to think about switching again. (I would)
WELCOME to YT - so glad you're here and you're baby looks ADORABLE!!!