Nope, just don't give him the pinky option. If you only feed him rat pups he'll be forced to eat them. Granted, you need to work him up to it, but if you feed him something slightly larger each week he'll eventually get the idea. If he's active, heavy, and seems to be all healthy than a vet visit will tell you you have a snake that is healthy who doesn't like to chew much
Just work him up to larger prey, is he on F/T now?