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Spartan Animal & Pest Control

Humane Animal And Pest Control In MA

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Top 6 Signs of Mice Infestations Every Homeowner Should Know

July 13, 2026 by Spartan Animal & Pest Control

ship rat (rattus rattus) emerges from unseen crevice on to a wooden floor in house interiorMice are notorious for their large, black eyes and big ears that make them cute in pictures, but if you meet them in real life, you may quickly develop a different opinion. When mice invade a home, they can quickly turn your comfortable sanctuary into a stressful place to live. And even worse, it can be hard to get rid of them once a mouse infestation starts.

The good news is that mice leave behind plenty of warning signs indicating that they have chosen your home as their own. By staying vigilant for these signs, especially during times of seasonal change, you can spot a mouse problem in its infancy and put a stop to it before a single visiting rodent becomes dozens. Homeowners should familiarize themselves with the signs of a mouse infestation so they can know when to take action.

Key Takeaways

  • Mice nest in human homes because they provide safety, food, and water.
  • Signs of mice in your home include scratching sounds, especially in walls and ceilings, and food or objects that have been chewed.
  • If you see a mouse or locate a nest (or the fluff and debris used to make one), you might have mice in your home.
  • Mouse droppings and the ammonia odor from their urine are common signs of mice.

The Top Six Signs of a Mouse Infestation in Your Home

No matter the species of mice, some signs remain very similar among them. If you are not sure whether you have one or more mice in your home, watch for small signs.

You see mice

The most obvious and reliable method to tell if you have a mouse infestation is if you see mice, and especially more than one. In fact, mice are secretive, quiet creatures by nature, and seeing one likely means there are several more. A mouse typically does not run around a human home during the day unless competition from other mice forces it to look for food and water at inopportune times. Thus, if you see one, it could be a sign of a much larger problem. Never assume that seeing one mouse means you only have one mouse.

You hear scratching sounds

Mice are avid nest builders and fast runners, so despite their small size, they can be nosy. Add to that the sharp tips of their claws and the usual places they roam (e.g., inside walls and ceilings, alongside baseboards), and you may notice consistent scratching sounds wherever they pass. One notable sign of mice is that if you hear a sound and go to investigate, it stops. The mouse will typically go quiet upon hearing or sensing your footsteps.

You see droppings

Mouse droppings are rice-shaped and tend to dry out quickly, leaving desiccated remnants behind. Look closely along baseboards, in corners, or in areas where the mouse would be relatively sheltered, such as beneath refrigerators or in cabinets. Mice defecate frequently, so droppings are a quick way to determine whether you have a mouse.

You notice compromised food or possessions

Mice enter human homes, especially during weather changes, to acquire easy access to food and water, as well as to build nests in a safe location. If you see food left on the countertop or in cupboards that has been chewed on, that is a strong sign that mice are involved. They may even chew on materials such as wood to access more preferred nesting sites.

You find a nest or nesting materials

curious small mouse peeking from a dark creviceMice nests tend to be fluffy, so stay vigilant for signs that mice are stealing soft materials. You may find holes chewed in pillows, fuzz on the floor, or a trail of string or fabric. Depending on where you look, you may even locate the nest, which will be a fluffball tucked away somewhere tight and dark.

You smell mice

Mouse fecal matter does not have a particularly strong odor, but their urine is much more pungent. Many people describe the acrid smell as ozone or ammonia, and the longer you delay mouse control, the worse this smell can get. It is also difficult to get rid of. Track the smell to where it is strongest in your home for a hint about where mice are nesting.

Get Professional Help for a Mouse Infestation

Whether you are unsure if you have mice or you have already found evidence that rodents have taken root in your home, be sure to call the professionals rather than relying on DIY solutions. Mice can carry diseases, and failure to eliminate them can lead their population to swell even further. Contact Spartan Animal & Pest Control to schedule an appointment and get started on stopping a mouse infestation!

Filed Under: Animal Control

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288 Hersom Street New Bedford, MA, 02745
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Spartan Animal and Pest Control
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Chelsea F
Chelsea F
14:21 16 Nov 22
Very professional I called for an appointment he was here the next day with everything needed. He understood how petrified I was over the rodent issue we were hearing in our walls. He was able to find and close up any possible outside entrances and placed outside poison and baits inside with more poison. He came 3 more times for check up and addressed my concerns and knock on wood he was right nothing has returned since. His work and prices are so worth it.
Elaine DaCosta
Elaine DaCosta
17:24 24 Oct 22
Corey showed up at the appointed time. Very friendly and thorough. He answered all the questions that I had. He explained to me exactly what he was doing and why. I’m very happy with the service.
Anne Rymszewicz
Anne Rymszewicz
20:19 14 Sep 22
I Called Corey Tuesday evening and he was here at 9:30 the next morning for a wasp problem in and out of our home. This is our second time using him as the first time was for a mice issue and after his visit, we have been mice free for well over a year now. His knowledge of these critters is amazing, knowing their detailed habits. Wishing I could give a rating over 5 Stars. Look no further for any time if removal of extermination - you will find no better person for the job.
Beth Squires
Beth Squires
22:34 24 Aug 22
Corey was excellent! He is responsive, professional, and honest. His prices are much better than other local pest services. I would highly recommend!
Linda D
Linda D
02:58 21 Aug 22
Corey was punctual and polite.He explained the procedure then eradicated the problem. I highly recommend this company.
Heidi Stucki
Heidi Stucki
10:37 12 Aug 22
Punctual and a reasonable price, I would recommend Spartan to family and friends!
Michael Duclos
Michael Duclos
21:09 03 Aug 22
I had a wasp nest somewhere below my deck, bothering the family in the swimming pool. No way I was attempting to find the nest myself without a bee suit and flamethrower, so I called Corey at Spartan. He went under there armed with only a flashlight, found the nest and took care of it! Not only was he prompt, fast, efficient and effective, but the guy had guts of steel. Hoping to never encounter any more killer bees, rabid raccoons, attacking ants, or any other predators, but if I do, I’m glad I know I got Corey on my side!
Randy Lauderdale
Randy Lauderdale
16:31 13 Jul 22
Called Corey on Sunday about a yellow jacket nest removal. He go right back to us on Sunday! Set up appointment. Corey confirmed and showed up right on time and quickly took care of the nest. Great service! Highly recommended
Eugene Karabanov
Eugene Karabanov
13:26 11 Jun 22
Absolutely fantastic service, quick to respond, knowledgeable, and stands by his work. Corey is a gem. Highly recommended.
BILLY ARNOLD
BILLY ARNOLD
19:49 10 Jun 22
As usual, Corey was on time and very conscience. He checked for the problem and got right to work on the solution immediately. I'll always call Spartan for any pest control needs.
Kawaii Kristina
Kawaii Kristina
18:57 07 Apr 22
We had a squirrel running around the attic and walls of our new home. After calling a few pest control places in the area, we decided on Spartan Pest Control as they had the most reasonable price, and fast friendly customer service. The owner is extremely personable, polite, and thorough. He uses humane traps, and guarantees his work for 3 years. I would definitely use them again!
Lisa Geraghty
Lisa Geraghty
19:01 03 Feb 22
Corey is so friendly and professional. His rates are fair. We had bats and mice to contend with and he was very thorough. I would highly recommend Spartan Pest Control. It was an absolute pleasure dealing with Corey.
Jennifer Zall
Jennifer Zall
01:20 31 Jul 21
Corey is very responsive, professional and friendly. We needed help getting rid of carpenter ants, spiders and a sizable wasps nest. He came right out and took care of all that for us. I highly recommend him for all animal and pest needs! We are very happy with his services.
Joanne Bento
Joanne Bento
16:26 13 Jul 21
Corey did an outstanding job at trapping a rat in my garden. Was trapped within 4 hours of him setting the trap. Very knowledgeable about wildlife. Highly recommend him.
David Barrett
David Barrett
19:52 26 May 21
I cannot recommend Spartan Animal and Pest Control high enough. Cory, the owner, was very professional, articulate and extremely knowledgeable. He did a superb job. Spartan also installs chimney caps and I had my chimneys capped as well. I hope I never have a pest problem again but if I do I will call Spartan without hesitation.
Lee Marie
Lee Marie
21:48 23 Mar 21
Prompt, efficient, personable.We had a pretty bad squirrel problem, and they got rid of them all. What i really liked was that they use humane means.I would definitely use them again.
Michael Brangwynne
Michael Brangwynne
21:33 07 Dec 20
Outstanding job. Moved his schedule around to come sooner than later. Very good businessman that was very professional and worked fast. Very knowledgeable and explained what he was doing with the service as he did it. Very reasonable price and overall great experience. Highly recommend.
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