Mine are not grain-free yet; however, I do stay away from all corn. Right now they get a full can of wet per day plus 1/4 cup of dry per day. The dry is salmon and brown rice. I brought home samples from the pet food store. Same brand, but one is grain free and one isn't. So far they like the lamb and brown rice, and I haven't opened the grainfree sample yet, so we'll see how that goes.