in our garage- it ran underneath the fridge, and when I moved the fridge out there was a lot of mouse crap. So I ran and grabbed our mouser cat and threw him back there- he wasn't the slightest bit interested in hunting, even when surrounded by mouse crap. I think he is used to hunting in the yard or field. We tried locking him in the garage for a few hours to see if he would get on is (its his job to keep our house mouse free- he's not pulling his weight!), but he still wasn't interested.
So here I am, the owner of a prolific mouser cat, ordering some mouse traps online.