I have a young (around 10 months) bp that I'm trying to switch over to rats. Whenever I'm offering the rat he's showing interest but never strikes. I've tried letting the rat sit in soiled mouse bedding and leaving it in the tub with him for an hour (F/T), but no luck so far. I've been offering a rat a little smaller than what he's use to every 5 days for the past 15 days with no luck. My question is: how long should I wait before I just offer him a mouse so he doesn't go hungry? He was severely underfed as a hatchling, and I've just recently gotten him to fatten up on large mice.