I used to be "pro-rat" feeding, but it's been changed over time. I've come to realize that if a snake will only eat mice, then don't switch it. It will probably only stress the snake out by trying repeatedly to switch him/her over. I mean, there is times when it's necessary (Burms, BCIs, BCCs, Retics, etc). But for a BP that can live it's whole life eating mice, why keep trying. If you really want to though, there is a lot of ways to go about it and one of them will eventually work. PM if interested.