You might not see the mice, but you can probably hear them after dark, as mice are often more active at night. Don’t be surprised if your pets paw at walls and cabinets where mice are hiding. Watch for mouse droppings and nests in storage areas, such as garages and basements. Nests are usually made of materials like bits of cloth or shredded paper. Or you can check for mouse tracks by dusting suspected areas with a light coating of unscented talcum powder or mason’s chalk dust. Wait a day and then shine a flashlight across the area. If you notice small tracks in the powder, then you’ll know that mice have been there.