Does he eat regular dog food? I don't know that the protein in the chicken and other meat it good for him. He should be getting at little protein as possible.
If he'll eat dog food, then Hill's k/d (kidney diet) or Medi-Cal Reduced Protien, or I dunno if Waltham's has a canine version of their Selected Protein, but you chould check. It's pricey, but it's probably the best he can get, and you can get both canned and kibble.