I feed wellness and Sadie is on both canned and dry... The vet told me her tummy is only about the size of a walnut! She gets 2 tea spoons of wet food every 4 hours... She get s about 5 feedings because I feel she needs to be feed before bed time to get her through the night.
She eats the wet food and dry well.... But my other yorkie Chewy has always been a picky eater and her just eats small portions at a time... If you switch to any thing make sure its puppy food and do it over time mixing the food your puppy is on now with what ever you decide to go to. If your pup is pooping and peeing and seems active and he is probably ok... They have tiny little tummies....