Pest control · rodents · updated Aug 2026
When Should You Call Pest Control for Mice or Rats?
One mouse can mean a passing visitor. A pattern of droppings, gnaw marks, and nighttime noise usually means a nest has already been established somewhere in the home. Here's how to tell which situation you're actually in.
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Why rodents are more than a nuisance
A single mouse can squeeze through a gap as small as a quarter of an inch, and a rat through a gap around the size of a half-dollar coin, which is why sealing entry points is only part of the solution. Mice reproduce quickly, a female can have several litters a year, so what starts as one mouse can become an established population in a matter of months if the entry point and nesting area aren't addressed.
There's also a health dimension that makes rodents different from most other household pests. Mice and rats can carry pathogens in their droppings and urine, including hantavirus and salmonella, and their gnawing can damage electrical wiring, which is a recognized fire risk. This is part of why rodent infestations are generally treated as a priority, not something to put off.
Signs to check for
Focus on kitchens, pantries, attics, basements, and along baseboards, these are the areas rodents use most for food, shelter, and travel.
Droppings near food, in cabinets, or along baseboards
Mouse droppings are small, dark, and rice-grain shaped, while rat droppings are larger, roughly the size of a raisin. Finding fresh droppings repeatedly in the same area points to an active, established presence, not a one-time visitor.
Gnaw marks on food packaging, wood, or wiring
Rodents gnaw constantly to keep their teeth from overgrowing, and they'll chew through cardboard, plastic packaging, wood trim, and electrical wiring. Chewed wiring in particular is worth taking seriously given the fire risk.
Scratching or scurrying sounds, especially at night
Mice and rats are mostly nocturnal, so sounds inside walls, ceilings, or the attic after dark are one of the most common early signs homeowners notice, often before they see an actual rodent.
A strong, musky odor in an enclosed space
Rodent urine has a distinct, sharp odor that tends to build up in enclosed areas like cabinets, closets, or crawl spaces with an active nest nearby. A persistent smell that doesn't go away with cleaning is worth investigating further.
Nesting material in hidden or undisturbed areas
Mice build nests from shredded paper, fabric, or insulation, tucked into wall voids, behind appliances, or in rarely used storage areas. Finding a nest, even without seeing the rodent itself, is a clear sign of an established presence.
Pet behavior changes near a specific wall or area
Cats and dogs often notice rodent activity behind walls or under floors before people do, and unusual scratching, sniffing, or fixation on one specific spot is worth paying attention to.
Seeing more than one of these signs?
A professional can locate entry points, remove the nest, and set up an exclusion plan so the problem doesn't come right back after traps are removed. Comparing local providers takes a couple of minutes.
See Local Pest Control OptionsCommon questions
Are store-bought traps enough for a small rodent problem?
Traps can catch individual rodents, but they don't address the entry point or, in a larger infestation, the full population. A professional inspection identifies how and where rodents are getting in, which is what actually prevents the problem from recurring.
How do I know if it's mice or rats?
Droppings are the easiest way to tell: mouse droppings are small and rice-grain shaped, while rat droppings are noticeably larger. Gnaw marks and gaps used for entry also tend to be larger with rats. A professional can confirm which one you're dealing with, since the exclusion approach differs.
Is it safe to clean up rodent droppings myself?
The CDC recommends specific precautions when cleaning areas with rodent droppings, including ventilating the space first and avoiding sweeping or vacuuming dry droppings, since this can spread airborne particles. For larger infestations, it's worth asking a professional about cleanup as part of the service.