I would go with Wellness, hands down!
Allergies are not only rampant to canines in general - but especially in yorkies - just ask any Vet Derm.
Royal Canin has so many potential allergens in it - I'd avoid it. If a dog is predisposed for allergies - there is really no sense in giving them a red carpet by feeding such common food allergens..whether or not food allergies are present in the dog.
Wellness Core is an excellent food.
__________________ ~ A friend told me I was delusional. I nearly fell off my unicorn. ~ °¨¨¨°ºOº°¨¨¨° Ann | Pfeiffer | Marcel Verdel Purcell | Wylie | Artie °¨¨¨°ºOº°¨¨¨° |