Quote Originally Posted by Acurtis2190 View Post
He's eaten rats for years though- is it normal for them to change and want mice all of a sudden even if they haven't fed on mice in five or six years?
Yep, totally normal. I have a few ball pythons that switch between rats and mice. If you want to get him back on rats, each feeding offer him a mouse and a small rat. The mouse gets him in feeding mode and hopefully increases the chances he'll take a rat. I have a large girl that was on mice. Each week I'd make sure to offer her a rat along with her usual mice, and she eventually started taking them. She might stop eating rats again, and I'll keep her on mice until she switches again.