I would def use what works best for your dog. Unless they are having some sort of negative reaction to the food like too much poop, itchies, hair loss, licking paws etc I wouldn't change. Each dog is different. Use what works best for you and your pup
Orijen is a fantastic food but not suited for every Yorkie. If your destined to feed a certain type of food, get a few samples and see which one your dog prefers.
Good Luck
Snick & Viv