A mouse is scratching under the baseboard—what should I do? - briefly
Identify and seal any cracks or openings leading to the wall cavity, then set snap or live‑catch traps baited with peanut butter near the source of the scratching; if the problem continues, call a professional pest‑control service.
A mouse is scratching under the baseboard—what should I do? - in detail
The sound of gnawing and scratching behind the baseboard signals an active rodent. Begin by confirming the presence of a mouse: look for droppings (small, dark, about ¼ inch long), gnaw marks on wood or wiring, and faint scent of urine.
Next, locate the entry point. Inspect the perimeter of the room for gaps larger than ¼ inch in the foundation, wall seams, plumbing penetrations, and vents. Use a flashlight and a mirror to view hidden cracks. Seal openings with steel wool, copper mesh, or expanding foam followed by caulk or cement to prevent re‑entry.
Choose a control method.
- Snap traps: place perpendicular to the wall, baited with peanut butter or chocolate. Position at least three traps per suspected pathway, spaced 12–18 inches apart.
- Live‑catch traps: set similarly, check every few hours, release captured rodents at least one mile from the residence.
- Electronic traps: deliver a lethal shock, require minimal bait.
If using poison, select a registered rodenticide, place in tamper‑resistant bait stations, and follow label instructions. Keep bait out of reach of children and pets.
Maintain a hostile environment for the pest. Remove food sources by storing pantry items in airtight containers, cleaning crumbs, and emptying garbage daily. Reduce clutter that offers shelter, especially cardboard boxes and fabric piles.
Inspect electrical wiring for damage; chewing can create fire hazards. Repair any compromised insulation promptly.
If activity persists after sealing and trapping, or if structural damage is evident, contact a licensed pest‑management professional. They can perform detailed inspections, apply advanced control measures, and advise on long‑term exclusion strategies.
Finally, schedule periodic checks of the sealed openings and traps to ensure the problem does not recur. Regular monitoring, combined with diligent sanitation and proper sealing, eliminates the risk of further intrusion.