To a homeowner, a rodent in the house is a rodent. To a technician, mouse and rat are different jobs. They use different gaps, different traps and different routes. This guide gives you a few ways to tell which one you may have, before the visit.
Droppings and what they say.
Mouse droppings are small, dark and roughly like grains of rice. Rat droppings are larger and often blunt or capsule-shaped. Fresh droppings are dark and soft, and old ones are gray and crumbly. Count them and note where they are, since a trail shows a route.
| Sign. | Mouse. | Rat. |
|---|---|---|
| Droppings. | Small, rice-sized, many scattered. | Larger, fewer in a group. |
| Gnaw marks. | Small, fine, often on packaging. | Larger, rougher, on wood and pipes. |
| Sounds. | Light scratching and scurrying. | Heavier thumping and dragging. |
| Nests. | Soft shredded material in hidden spots. | Bulky nests in attics, crawl spaces and burrows. |
| Routes. | Short paths along walls. | Regular runs along fences and foundations. |
Where each tends to be found.
Mice often live right inside the house, in kitchens, pantries and walls. Rats often live in burrows outdoors or in attics and crawl spaces and travel to food. Roof rats climb and tend to be higher up, and Norway rats tend to be low.
These are tendencies, not rules. A technician looks at the sign in front of them instead of relying on a general guide.
Damage that points one way or the other.
Mouse gnawing is fine and often found on food packaging, soap and soft materials. Rat gnawing is rougher, on wood, pipes, insulation and sometimes wiring. Greasy rub marks along walls show a regular route.
- Check pantry packaging for small holes and torn corners.
- Look along baseboards for dark rub marks.
- Check stored items in the garage for shredded material.
- Look at pipes and wood for larger bite marks.
Why the difference matters.
A trap sized for a mouse may not hold a rat, and a mouse can pass places a rat cannot. Sealing materials also differ. Mice can be stopped by fine steel mesh, and rats need heavier material.
Our pages on mouse control and rat control explain each plan. If you are unsure, inspection comes first.
Mouse or rat does not matter yet. Describe the sign and we will sort out the rest together.
Dial (888) 686-4821Take notes and photos.
Before the visit, photograph droppings next to a coin for size, and note where you see them. Write down any sounds and times. This helps the technician arrive with the right tools.
Not certain what you are dealing with? That is fine. Phone, describe what you saw and we will point you to the next step.
What a technician adds.
Your own notes are useful, but a technician brings experience with how sign fits together. Fresh droppings, rub marks, burrow shape and the way a gap was chewed all point toward a species and an age. That is why a short walk-through often settles a question that days of guessing did not.
Tell the technician about anything you have already tried, including traps, bait or repellents. It changes where they look and how they set up, and it keeps pets and family safe. Photos of anything unusual, taken beside a coin or a ruler for scale, are especially helpful and take only a moment.
Young rats and adult mice can be confused, since a juvenile rat is small. Foot size, tail length and the thickness of the body help a technician sort them out in seconds, which is another reason a visit beats guesswork.
Cleanup safety, based on public health advice
Planning to tidy up before someone arrives? Do it in this order, and if you are unsure, wait and ask.
- No dry sweeping, vacuuming or blowing of droppings, stains or nest material.
- A space closed up for weeks needs fresh air. Open it, step away and return in roughly half an hour.
- Put on rubber or plastic gloves, and when the job is finished wash both hands with soap and running water.
- Droppings should be fully wet before anyone touches them, and left about five minutes.
- Everything wiped up goes into a sealed bag before the trash can, and carcasses need gloves.
- Unwell some weeks after cleaning up? Describe the rodent contact to a clinician, because that judgment is theirs.
Public guidelines behind this advice
Public documents sit behind the advice above. They set out general practice and rules, and none of them endorses us.
- CDC page on rodent cleanup: Airing out, wetting down and bagging up, described for ordinary households.
- CDC page on hantavirus prevention: Keeping contact with rodents low around a home: seal gaps, store food and clear nest spots.