Our two snakes can be difficult to feed. Our Brazilian Rainbow Boa needs to be put in a smaller feed box with a heating pad under it and a dark towel over it then she will eat. Our Mexican Rat snake wasn't eating because his food was too big, gave him 3 smaller mice and he ate the lot. Do not fear, snakes can go quite a while without eating. Perhaps the food was old, or too large for him. Sometimes they won't eat if it is the wrong color. Our Boa won't eat white mice. It could be a number of things, relax, take your time and think about all the things it could be then start trying different things.