We had mice and rats in the house after the old cat left us. I used to hear them having parties in the walls, see them scurry across the floor at night, etc. I went on craigslist and typed the word "mouser". We adopted Max the cat who was available because he "ate the hamster" at his former dwelling. Now we have no mice in the house, and very little sign of them elsewhere. See if you can round up some barn cats to help you out! (My husband set slap traps in the basement and caught lots of rats...) Anyway, now Max helps keep the bunnies from eating the garden as well. Nothing like a domesticated predator to help with rodent control, IMHO.