
I'm not clued up on many of the newer completes around (like you with Fagan, I prefer to go with raw in the main) it's hard to keep track of all of the "new", then "improved" and rapidly followed by "now the best ever" claims LOL. I also have found that many contain chicken or poultry fats, meal etc despite the bags saying something quite different .......
Could you
(a)not continue with raw but miss out chicken?
(b)use an adult sensitive maintenance brand of your choice with say lamb or fish as the meat protein and mix in tripe, eggs, offal, minced meat etc ?
(c) if that's not ideal use either something like Nature Diet Puppy or a kibble puppy variety of the same diet for extra calories?
regards, Teri