mine used to do this when he was a baby. now, what i do is i make sure that i soak them in really hot water for 15-25 minutes before i feed it to him, and when i take the mouse out of the bag to give to him, i press on its belly a little so there is a little bit of blood on the tip of the feeder's nose. He goes right for it now, hasn't missed scince i started doing that.