The pre-made raw stuff is a bit too expensive to feed my 85 pound dog, so I just buy meat and organs direct and feed him that way, but it does work well for my cats, who eat far less.
I also fast my dog a couple times a week, and he's in excellent health. Dogs are even more adapted to intermittent fasting than we are.
Millions also seem to do just fine on grains, but we know how that goes. I'd suggest trying raw for two months to be sure.