By JP And Sons Pest Solutions — El Cajon, serving San Diego, Santee, and La Mesa
Rats and mice don't need an invitation. A gap the size of a dime, an open garage door, or a vent that isn't sealed can be enough for them to move in — and once they're inside, they multiply fast.
Here's how to tell them apart, what signs to watch for, and what actually keeps them out.
Rats vs. mice: what's the difference?
They're both rodents, but they behave differently — and that matters for how they're handled.
Mice are smaller, usually 2 to 4 inches long not counting the tail. They can squeeze through a gap as small as a dime, and they tend to stay close to food and shelter once they find it.
Rats are larger, usually 7 to 9 inches long not counting the tail. Roof rats are common in Southern California and are good climbers — they often get in through attics, rooflines, and trees touching the house. Norway rats tend to stay lower, near the ground, garages, and crawl spaces.
If you’re not sure which one you have, don’t guess — the signs and the entry points usually tell the story.
Signs you might have rodents
Watch for these warning signs, especially in kitchens, garages, attics, and crawl spaces:
Droppings near food, in drawers, along walls, or in the attic and garage.
Gnaw marks on wood, wiring, food packaging, or plastic containers.
Scratching or scurrying sounds in walls or ceilings, especially at night.
Greasy rub marks along baseboards, pipes, or beams where rodents travel the same path repeatedly.
Nests made from shredded paper, insulation, fabric, or plant material.
A musky odor in an enclosed space, or pets suddenly fixated on a wall, cabinet, or appliance.
Rodents are mostly active at night, so you may hear or smell them before you ever see one.
Why they matter — beyond the noise
Rodents aren’t just a nuisance. They chew through wiring, insulation, and wood, which can create fire risks and expensive repairs. They contaminate food and surfaces with droppings and urine, and they can carry diseases and parasites. A small problem left alone rarely stays small — one pair of mice can produce many offspring in a single year.
That’s why early action matters more with rodents than with most other pests.
What you can do to keep them out
Exclusion — sealing them out — is the most important step. These habits help:
Seal gaps around pipes, vents, doors, and windows, and check rooflines and attic vents.
Keep garage doors closed when not in use, and trim tree branches that touch the roof.
Store food, pet food, and birdseed in sealed containers, and clean up fallen fruit from yards.
Remove clutter in garages, attics, and crawl spaces where rodents nest.
Fix leaks and remove standing water — rodents need water as much as food.
Keep trash in sealed bins and take it out regularly.
Traps can help catch rodents already inside, but trapping alone won’t solve the problem if entry points stay open. New rodents will keep finding their way in.
When to call a professional
Call sooner rather than later if you see droppings, hear scratching at night, find gnawed wiring, or keep catching rodents and the problem doesn’t stop. A professional inspection can find entry points you might miss — in attics, crawl spaces, rooflines, and garages — and lay out a plan to seal them and deal with the rodents already inside.
At JP And Sons Pest Solutions, we inspect homes across El Cajon, San Diego, Santee, and La Mesa, explain what we find in plain language, and walk you through your options before any work starts. No pressure, no jargon — just a clear picture of what’s going on with your home.
Get your home checked
If something in this post sounds familiar, don’t wait for a small rodent problem to turn into a big one. A quick inspection can save you a much bigger repair bill down the road.
JP And Sons Pest Solutions
Phone: (619) 942-6826
Email: jose@jpandsonspest.com
Website: https://jpandsonspest.com
Serving El Cajon, San Diego, Santee, and La Mesa, CA