Signs of Mice in Your House (Edmonton Guide)

28 October 2026

By BugsNPests · Last reviewed 28 October 2026 · 6 minute read

Quick answer: the most common signs of mice are small dark droppings, scratching in walls at night, gnawed packaging, shredded nesting material, greasy rub marks along walls and a musky smell. Two or more of these usually mean mice are established, not a one-off visitor.

Key takeaways

Droppings, noises and gnawing are the clearest signs.
Mice fit through gaps of about a quarter inch (6 mm), so a tidy home can still get them.
Do not sweep or vacuum droppings. Clean up safely.
Seal entry points. Removing mice alone does not stop new ones.
If you see two or more signs, call for an inspection.

Seeing droppings right now? Call 780-716-3943 or send a photo on WhatsApp for a free ID.

8 Signs You Have Mice

#	Sign	What it usually means	What to do
1	Small dark droppings, about the size of a grain of rice, under sinks, behind the stove and along baseboards	Mice are active in that spot. Fresh droppings are dark and soft, and old ones are dry and grey	Photograph them, then clean up safely (see below)
2	Scratching, scampering or squeaking in walls, ceilings or the attic, usually at night	Mice are moving through wall voids or nesting nearby	Note where and when, and call for an inspection
3	Gnawed food packaging, cardboard, soap or wiring	Mice are feeding and wearing down their teeth	Move food to sealed containers and check wiring
4	Shredded paper, insulation or fabric in hidden corners	A nest, often behind appliances or in storage	Do not disturb it with bare hands. Call us
5	Greasy rub marks or dark smears along the bottom of walls	Mice use the same runs along edges every night	Mark the runs and tell us
6	A musky or ammonia-like smell in cupboards or storage	A growing colony	Call soon. Smell grows with numbers
7	Tiny footprints or tail marks in dust	Recent traffic	Dust a little flour in a safe spot overnight to see tracks
8	Your pet sniffing, scratching or staring at walls and appliances	Pets often hear and smell mice before you do	Take it seriously and inspect those areas

Seeing a live mouse in daylight can mean a crowded nest, because mice are mostly active at night.

What Do Mouse Droppings Look Like?

Mouse droppings are small, dark and pointed at the ends, about the size of a grain of rice. You will usually find many in one area. Fresh ones look dark and moist. Older ones turn dry, grey and crumbly. If you see a few droppings in several rooms, mice are travelling through the house, not just visiting one spot.

Noises in the Walls at Night: Mice or Something Else?

Mice: light scratching, scampering and squeaking, mostly at night

Squirrels: heavier thumping and running, often at dawn or dusk or in daylight. See squirrel removal.

Pipes and settling: knocking or ticking that follows heating or cooling, without scratching

If the noise is in the attic or roofline and you are unsure, send a short voice note or video to our WhatsApp and we will help you tell.

Where to Look First

Under the kitchen sink and behind the dishwasher
Behind the stove and fridge
In the pantry, especially around cereal, pasta and pet food
The garage, near stored boxes and the door seal
The basement, around utility pipes and furnace areas
The attic and along the roofline

Why Mice Come In as Edmonton Nights Turn Cold

Edmonton note: when temperatures drop in fall, outdoor food and shelter run short, and a warm house with a pantry is the best option available. A mouse can squeeze through an opening of about a quarter inch (6 mm), roughly the width of a pencil. Common entry points include gaps around gas lines and pipes, dryer and furnace vents, worn garage door seals, the gap under exterior doors, foundation cracks and unscreened roof vents.

What to Do and What Not to Do

Do	Do not
Store food, pet food and birdseed in sealed containers	Leave pet food out overnight
Seal visible gaps around pipes and vents	Block holes with paper or foam alone, because mice chew through it
Keep firewood and compost away from the house	Sweep or vacuum droppings
Take photos of droppings and entry points	Use loose poison where children or pets can reach it
Call for an inspection if you see two or more signs	Wait for the problem to “go away”

How to Clean Up Mouse Droppings Safely

Open doors and windows to ventilate, and wear rubber gloves.

Soak droppings, nests and dead mice with a bleach and water mix (1 part bleach to 9 parts water) or a household disinfectant. Let it sit for about 5 minutes.

Wipe up with paper towels, place everything in a plastic bag and dispose of it.

Never sweep or vacuum droppings. The dust can carry hantavirus.

Wash your gloves before taking them off, then wash your hands.

For large infestations, or enclosed spaces with poor ventilation, call Health Link at 811 before you start. If you develop flu-like symptoms or trouble breathing after exposure, see a doctor and tell them about the mice.

When to Call a Professional

Call us if any of these apply:

You see droppings in more than one room, or fresh droppings every day
You hear scratching in walls, ceilings or the attic
You find a nest or gnawed wiring
You have caught a few mice and are still seeing signs
You want the entry points found and sealed, not just the mice removed

Call 780-716-3943 now, WhatsApp us a photo, or request a free quote. We answer 24/7.

Mice Control Plans and Prices in Edmonton

Starting prices, GST extra. You get a free quote before any work starts.

Plan	Starting at	Best for
30-Day Mice Control	$450	A new problem caught early
90-Day Mice Elimination Plan	$600	Established or repeat infestations
12-Month Rodent Protection Plan	$950	Homes that get mice every fall

Larger gaps such as foundation openings, deck skirts and rooflines are quoted separately after the inspection. Compare all mice control packages.

FAQs

If I see one mouse, are there more?

Often yes. Mice breed quickly and live in groups, so one sighting, especially in daylight, can mean more are hiding in walls, the attic or storage areas. An inspection tells you how many entry points there are and where.

Do mice mean my house is dirty?

No. Mice look for warmth, food and shelter, and any gap about a quarter inch (6 mm) wide can let them in. Clean homes get mice too.

What does a mouse infestation smell like?

A strong musky or ammonia-like smell, often in cupboards, behind appliances or in the attic. The smell gets stronger as the colony grows.

Are mouse droppings dangerous?

They can be. Dust from droppings, urine and nests can carry germs, including hantavirus from deer mice in Alberta. Never sweep or vacuum them. Wet them with a bleach and water mix or disinfectant, wipe up with paper towels and bag them.

How long does it take to get rid of mice?

It depends on the size of the problem and how many entry points need sealing. We give a timeline after the inspection, and follow-up visits confirm that activity has stopped.