I was at a large rat every two weeks (my pet store only carried large f/t rats and live mice) I've had a bad experience with live prey attacking her. The vet thinks she's blind in one eye, so depth perception is an issue for her. They finally, at my request. Ordered medium frozen rats, and I'm going to bring her down to once a week, to a week and a half on a medium rat. I've never had her go off feed, so I'm not worried about her eating, I'm more worried about her over eating. I usually weigh her once a month, but I'm going to start weighing her a few hours before feed.