Hey I don't mean to jack this thread, but it is just too perfect. I'm having the exact same issue. My girl fed constantly and suddenly went off food. Hasn't eaten in 3 weeks. I'm not too worried about the fast, but how do I know when to feed again? Its a huge hassle to drive across town to pick up a live rat and then drive back over to return it when she doesn't feed. Anything I should look for?