Hi All.  I am getting ready to switch maddie to a grain free food.  Not sure which one, yet. It all gets so confusing

...
But one question I have is how much protein is too much.  I know too much protein in not good and can cause some serious problems.  Maddie spends most of her day curled in her bed, my bed 

, or on the couch.  Any help with this topic would be greatly appreciated.
Thanks