Hey Stedmansmommy!
I just switched Zoe on to a new grain free food, I had been using Solid Gold but it gave her the poops poor lil girl. I've got her on a puppy food by Orijen, I've heard lots of good stuff about it. I don't know if they have a low-cal version but she loves the puppy food. The only thing is her poops come out hard and very dark (sorry) but the vet said that it was normal because it's a high quality grain-free food.
Best of luck!
D-