My guy did that last year. I had to get him smaller mice for a while because he was terrified of the bigger ones for a bit there. When I stuck him with a smaller mouse (not quite hopper sized, but a small juvie) he took it. I gave him a bit larger one the next time, and after that size didn't matter anymore. Little bugger still won't take a rat pup or small rat though. Darn him. Lol. He'd grow so much faster if he'd just take rats. :/
Anyway, try a smaller juvie if he was on larger before. If not, then yeah maybe try a hopper. If THAT doesn't work, try getting a different color mouse. Good luck!![]()