Last week I decided to make the transition to rats, my BP has been on medium mice for a while now. I bought a pack of weaned white rats, looks identical to the mice I've been feeding him, and he showed a little interest then just ignore it for the rest of the time it was in there. I feed my BP f/t and he has never ate live. I compared the rat to the size of his body and he could definitely take it. I'm not sure if he just doesn't like rats, or if he was intimidated by the size, or if he thought he could not swallow it.
I'm going to investigate whether it's the size or the type of rodent, first of all I will purchase a smaller rat, if he still does not take it I will attempt adult mice.
Opinions on whether he is scared or whether he just doesn't like rats? Either way I'm still going to have to test it, just wanted to get some thoughts first. Worst comes to worst I'll just have to start feeding him doubles when he reaches the max mouse size which my local reptile supplies sell.
Edit: I replaced the weaned rat with the medium mouse after he wasn't eating it, then he ate the medium mouse straight away, so I'm certain he is not fasting.