Are you feeding the Nulo kibble? Or their freeze-dried raw?
I've fed the freeze-dried raw when my dog was convalescing after major surgery and cancer treatment. It was very convenient to use as shelf-stable raw. He's got a tender tummy, and this stuff is very appetizing. I can't comment on their kibble, but the freeze-dried is good stuff, and labeled for all life stages. It's VERY expensive though...though less so for a little pup than a big dog.