The 6 confirm-it signs
- Sounds in the walls or ceiling at night — light scratching, soft pattering. Mice are nocturnal; you almost never hear them during the day.
- Droppings: small (¼ inch), dark, pointed at the ends. Found in drawers, under sinks, in pantries, on top of cabinets.
- Chewed cardboard, paper, or insulation — especially around pet food, dry goods, or stored items
- Greasy "rub marks" along baseboards, around pipe collars, and at the top of foundation walls — mice run the same paths repeatedly
- Pet food disappearing overnight, dog kibble in unusual places
- Faint musky / urine odor in confined spaces (under-sink cabinet, basement closet)
What's NOT mice
- Squirrels in the attic — heavier, scampering during day, much louder
- Bats — usually only at dusk + dawn, sounds in the eaves not the walls
- Birds nesting in vents — chirping, distinct from rodent scratching
Why you can't wait
A breeding pair of house mice in optimal conditions can produce 5–10 litters per year, 5–8 pups per litter. The math gets ugly fast:
- Month 1: 2 mice → 8 mice
- Month 3: ~28 mice
- Month 6: 100+ mice
- After 1 year: 2,000+ theoretical, ~150 practical given resources and territory
Mice also gnaw electrical wiring — a recognised fire risk, and one reason chewed insulation gets flagged on home inspections — and they contaminate stored food. You will see a specific percentage of house fires attributed to rodents quoted all over the internet; we do not repeat it, because we have never been able to trace it to a primary source.
The right response
Snap traps placed perpendicular to walls (where mice run) outperform glue boards and poison stations for in-home mouse problems. But traps alone don't fix it — you need exclusion (sealing every entry point larger than 1/4 inch). Read about our mouse exclusion process →