I feed him live and am trying to work him in to live fresh killed since i don't want to mess up the warming process in any way that would end up hurting him and he has never been bit by a mouse when ever i feed him i keep a close eye on him and something in my hand like a pencil or something in case the mouse's head is sticking up out of his coil or where it might have a chance to bite him so he has never received an injury from that.