Mice in the House? 7 Warning Signs You Shouldn’t Ignore
Finding out you have mice in your home is never pleasant—but catching the problem early can make a huge difference. Mice reproduce quickly, contaminate food, and can cause structural damage if left untreated. Knowing the warning signs helps you act before a small issue becomes a full-blown infestation.
At R.H. Miller Pest Services Inc., we help homeowners identify rodent problems early and provide reliable, professional rodent service to stop infestations at the source. Below are seven common signs of mice in the house—and how to tell them apart from rats to avoid confusion.
Small Droppings Around the Home
One of the most common signs of mice is their droppings. Mouse droppings are:
Small (about ⅛–¼ inch)
Pointed at both ends
Often found near food sources, cabinets, drawers, or along walls
Mice vs. Rats:
Rat droppings are much larger (½–¾ inch) and usually blunt at the ends. Size alone can help determine which rodent you’re dealing with—and what level of rodent service is needed.
Scratching or Scurrying Noises
If you hear scratching, squeaking, or light scurrying sounds—especially at night—there’s a good chance mice are active in your walls, ceilings, or attic. Mice are nocturnal and tend to explore when your home is quiet.
Mice vs. Rats:
Rats are heavier and typically make louder, more deliberate noises. Lighter, rapid sounds often point to mice.
Gnaw Marks on Food or Packaging
Mice constantly gnaw to keep their teeth from overgrowing. You may notice:
Chewed food packaging
Holes in boxes or bags
Damage to pet food containers
Mice vs. Rats:
Mouse gnaw marks are smaller and more delicate, while rats leave larger, rougher chew marks. Both require professional rodent service to prevent ongoing damage.
Grease Smudges and Tracks
As mice travel along walls and baseboards, the oils in their fur leave behind dark smudges or rub marks. You may also spot tiny footprints or tail marks in dusty areas.
Mice vs. Rats:
Rat grease marks are usually thicker and more noticeable due to their larger bodies.
Nests Made From Shredded Materials
Mice build nests using soft, shredded items such as:
Paper
Insulation
Fabric
Cardboard
These nests are often hidden in wall voids, attics, basements, or behind appliances.
Mice vs. Rats:
Mouse nests are smaller and more compact. Rat nests are larger and often found in lower levels or outdoor burrows.
Unusual Pet Behavior
Pets often detect rodents before humans do. If your dog or cat suddenly fixates on walls, cabinets, or appliances, they may be sensing mice activity.
Mice vs. Rats:
Pets may react more intensely to rats due to their size, but either rodent can trigger alert behavior.
Strong or Musty Odors
A persistent musky smell can indicate an active rodent infestation. As populations grow, odors become stronger due to urine and nesting materials.
Mice vs. Rats:
Rats generally produce a stronger odor, but even a small mouse infestation can create noticeable smells over time.
Why Correct Identification Matters
Mice and rats behave differently, enter homes differently, and require different control strategies. Misidentifying the rodent can lead to ineffective DIY treatments and prolonged infestations. That’s why professional inspection is a key part of effective rodent service.
At R H Miller Pest Services Inc., our trained technicians accurately identify the rodent species, locate entry points, and implement proven control and prevention methods designed for long-term results.
When to Call R H Miller
If you notice one—or several—of these warning signs, it’s time to call a professional. Rodents multiply quickly, and early intervention can save you time, money, and stress.
Our expert rodent service focuses on:
Proper identification of mice vs. rats
Safe, effective removal
Exclusion and prevention strategies
Long-term protection for your home
Don’t ignore the signs—addressing a rodent problem early is the best way to protect your home and family.