Back when I was in my late twenties I lived in a little five acre ranchette when I was going to school rented a room from this couple. They had milk cows and they had chickens and grain of course and they had a big mouse problem. When I moved in I had a female ferret and one night after a mouse had crawled over my face the next day I went around the room found the holes they were coming through the drywall. And then that night I just waited until I heard them scratching and I opened up my females cage and turned her loose needless to say within a week I had no more mice in my room. And she wou