Mice are opportunists and will typically choose to hide near a food source, so look for them in kitchens, pantries and basements. They're also known to be attracted to unattended pet food dishes and garbage cans. They'll choose hiding places that are dark, warm and out-of-the-way, such as under or inside of furniture, inside walls and even in cabinets. At night, when it's dark and the house is quiet, the mice will emerge from their hiding places to look for food.