7 months is an ok age. You can go with a food like Merricks or Chicken Soup that have all stages so you can feed both a pup and an adult the same food. Just remember to mix the food together to get him used to the new food.
I don't feed Royal because it has corn and can cause allergies in yorkies. Not sure what foods are available in your area but try to feed the best quality of the foods you can.
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