A house mouse can squeeze through a gap the width of a dime, breeds year-round in San Diego's mild climate, and a single pair turns into a household problem fast. Mice stay close to food and shelter, which puts them in kitchens, pantries, garages, and the wall voids in between. We deal with mice by sealing the small openings they use, removing the ones already inside, and checking back to be sure it stuck.
Why mice are a year-round problem here
In colder parts of the country mice push indoors mainly in fall. In San Diego the mild, dry weather lets house mice stay active and breeding through the whole year, so an unsealed home can host mice in any season. They are drawn to easy food and quiet nesting spots, and once a few are established they reproduce quickly.
Mice do not need much of an opening. Gaps under the garage door, around utility pipes, behind the stove and dishwasher, and along the base of exterior doors are all common entry points. Because the gaps are so small, mice are often getting in through openings a homeowner would never think to check.
How to tell mice from a young rat
Mouse droppings are small, dark, and pointed, about the size of a grain of rice, and you find them scattered in drawers, under sinks, along baseboards, and in the pantry. You may also notice a faint musky smell in an enclosed cabinet, small gnaw marks on food packaging, or shredded paper and insulation used for nesting.
Mice tend to stay within a small range of their nest, so activity is usually concentrated in one part of the kitchen or garage. That pattern helps us place traps where they will actually work rather than guessing.
Our approach to mice
We inspect the kitchen, garage, laundry, and the exterior to find the dime-sized gaps mice are using, then seal them with materials mice cannot gnaw through. Sealing first is what keeps the problem from simply repeating after the current mice are gone.
For removal we place traps and tamper-resistant bait stations along the walls and runways where the droppings and activity are, kept away from living space and out of reach of pets and kids. We check and reset as needed, and a follow-up visit confirms the mice are cleared rather than assuming a couple of traps did the job.
Why mice are worth taking seriously
Mice contaminate far more food than they eat, leaving droppings and urine across pantry shelves and prep surfaces. They gnaw constantly, including on wiring, and they nest in wall voids, appliances, and stored items. Because they breed so quickly, a small mouse problem left alone in San Diego's climate rarely stays small. Sealing the entry points and clearing the colony early keeps it from spreading through the house.