I've never had a "mouser" before. All my Balls have been on ft rats and mice from about a year old or so. If tough love dose not work, try to wash a rat with non scented soap and rinse real well, then roll it around a bit in a bag with a mouse.
I don't think soap is a good idea....
Dude if you have a snake on f/t that will only eat mice, f/t or not, that's what a mouser is.
Chloe
0.1 Het Hypo- Indy
The cup is useful because of it's emptiness