Rats and mice are good at staying hidden, so most people notice the evidence before they see the animal itself. Here are the signs to watch for.
1. Droppings
Small dark droppings along walls, in cabinets, under sinks or in the attic are one of the clearest signs of rodent activity.
2. Gnaw marks
Rodents chew constantly. Look for gnawing on food packaging, wood, plastic and wiring.
3. Noises at night
Scratching or scurrying in walls, ceilings or attics — especially after dark — often points to rodents.
4. Nests and shredded material
Shredded paper, insulation or fabric tucked in quiet corners may be nesting material.
5. Grease marks
Dark smudges along walls and baseboards can form where rodents repeatedly travel.
6. Odor
A persistent musky smell may indicate an active infestation.
7. Pets acting strangely
Dogs and cats may fixate on a wall or appliance where they hear or smell rodents.
What to do next
Rodent problems tend to grow quickly. A professional inspection can locate entry points and recommend control and exclusion.