I've had mice problems out in the barn too. Got a cat. She takes care of 95% of it. Traps take care of some too. They love peanut butter. Don't want to poison them. Might inadvertently kill my cat. I've also put wire mesh in the areas of my 39 that mice could possibly get in. It's done in a way, that you wouldn't know it's there. Haven't had any mice in years now.
