Squirrels and mice often get caught behind walls while in search of food or water. Mice usually enter walls through small, narrow openings at the base of the wall, while squirrels usually enter walls through the attic. Evidence of squirrels or mice behind walls include high pitched squeaking noises and the incessant sound of movement. Learning how to get rid of a mouse or squirrel inside your wall is essential if you want to prevent the animal from dying and stinking up your home.
Pinpoint the exact location of the mouse or squirrel inside the wall. You can use your ears or your nose to pinpoint the location of the animal.
Cut a hole in the wall large enough for the live trap to easily fit in and out. The University of Nebraska-Lincoln does not recommend attempting to capture squirrels by hand, as they are very evasive and have a powerful bite.
Bait the live trap with peanut butter and place it into the wall. Both mice and squirrels are attracted to peanut butter. Temporarily cover the hole in the wall with cardboard to prevent the animal from exiting and entering the interior of your home. Live traps come in a variety of sizes; purchase them at a hardware store. Check the trap regularly.
Remove the trap from the wall. Release the animal back into the wild or take it to your local humane society or veterinarian.
Fix the hole in the wall. Use a self-adhesive patch to keep the replaced wall intact. You can purchase a self-adhesive wall patch at hardware stores.
Close all holes in your attic and wall to prevent mice and squirrels from re-entering your wall. Use plywood to seal all attic entrances and use caulking or steel mesh wire to seal off all small entry holes in the wall.
Cut the hole in the wall at least 1 to 2 feet from the base of the wall to ensure you don't accidentally cut into the mouse or squirrel. If the mouse or squirrel is already dead behind the wall, remove it wearing protective hand gloves and place it into a secure garbage can.
Use caution when cutting into the wall to prevent hurting the animal or tearing into any electrical wires.