We dont have mice in our current place, at least as dar as i know. But when i lived in NYC they were inevitable. My cat Harry earned his keep two or three times per year in that apartment. They'd ysually come out at night and i'd wake up to him scrambling out of bed to take care of business. I kept an old tupperware on hand to remove the little trspassers to the street before Harry had a chance to kill them.