There are many good foods. But whatever you choose, as long as you slowly mix it with the old, it shouldnt be a shock to their system.Or mix it with small amounts of rice, and this will help not upset his belly. My yorkie is on Taste Of the WIld, and does very well on it. But he doesnt have a picky bone in his little body. SO he will eat anything. But i do have a rat terrier who is as picky as they come, and he loves Wellness food
But I have never tried blue buffalo.