Ever spotted tiny droppings around your home and thought, “That BETTER not be mouse poop!” 

Mouse droppings look like brown or black pellets that are super small (about 1/2 inch) and point on either end. 

Think of them as slightly larger (and less appealing) grains of rice.

Let’s look at some examples:

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How To Identify Mouse Dropping 

pictures: what does mouse poop look like

  • Size and Shape:
    • Typically small, resembling rice grains.
    • Rod-shaped with tapered ends between 1/4-1/2 inch.
  • Color:
    • Dark brown to black, often depending on the mouse’s diet.
  • Texture:
    • Smooth and solid when fresh.
    • Turns hard and brittle with time.
  • Location:
    • Usually found along travel routes, near food sources, or nesting areas.
mouse poop picture

Photo Credit: Victor Pest

How Often Do Mice Poop?

Mice are prolific poopers, leaving about 50-75 droppings per day!

The more you notice, the bigger the infestation problem you probably have. 

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Is mouse poop dangerous to humans?

mice diseases

Yes, exposure to mouse droppings and urine for too long can pose short and long-term health risks. 

There is

  • Hantavirus Risk:
    • Transmitted through breathing in particles from dried feces containing Hantavirus.
    • Symptoms include fever, severe muscle aches, and fatigue. It can lead to trouble breathing. 
    • There have been 850 reported cases between 1993-2021, with some resulting in death. 
  • Salmonella:
    • Severe food poisoning that can happen when mouse poop gets into your food.
    • Symptoms include stomach cramps, chills, and headaches.
    • Yes, there are reported cases of salmonella through mouse droppings!
  • Rat-bite fever and Haverhill fever:
    • Viruses carried by rats in North America.
    • Symptoms include vomiting, fever, rash.
    • Can be fatal in 10% of cases.

Even your pets are at risk (and if you know us, we’re very serious about protecting fur babies). Your dogs and cats are most at risk for Leptospirosis, which they can get through contact with mouse urine (primarily through water). 

Here are the signs to look out for for your pets.

Where To Look for MORE Mouse Droppings

where to look for mouse poop

Every winter, more than 21 million homes in the U.S. start to see more signs of rodent infestations. 

You may have started to notice them in your kitchen, but make sure you do a thorough sweep of your entire house for more droppings. This can tell you how big a problem you may have.

Here’s where to look for mouse droppings INSIDE your house:

  • Under the couch
  • Kitchen (especially the kitchen counter and stovetop)
  • Near appliances such as laundry machine and water heater
  • Drawers
  • Closets
  • Under sink
  • Attics or crawlspaces

Here’s where to look for mouse droppings OUTSIDE your house:

  • Entry points (look for holes in outside pipes or vents)
  • Garage
  • Barns or sheds
  • Trash

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How to Clean Mouse Poop

how to clean mouse poop

Here are the CDC’s step-by-step instructions for cleaning up mouse poop:

  1. Put on rubber gloves
  2. Spray the area where you found the droppings with a disinfected spray and bleach. Let it sit for 5 minutes. 
  3. Use a paper towel to clean up the mouse urine or droppings and throw it away.
  4. Mop or sponge the area with your disinfectant or a bleach solution with 1.5 cups of bleach and 1 gallon of water.
  5. Wash GLOVED hands with soap. 
  6. Remove gloves and wash your hands with soap and warm water.

For a thorough clean-up:

  • Wash any clothes or bedding that comes into contact with mouse poop.
  • Empty and throw out cardboard boxes containing droppings. 
  • Empty and disinfect plastic containers.
  • Use the above process to clean barns and sheds, ensuring airing out the unit for 30 minutes or longer. 


  • Vacuum mouse pellets. This will cause them to become airborne, which gives you a higher chance of getting those diseases we mentioned earlier.

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Dealing with a Mouse Infestation

Dealing with a mouse infestation requires a systematic approach to eliminate the rodents and prevent future occurrences effectively:

  • Identify Entry Points:
    • Locate and seal potential entry points, such as gaps, cracks, or openings, to prevent mice from entering your home.
  • Get Rid of Hiding Spots:
    • Maintain cleanliness by eliminating food sources, securing trash, and regularly cleaning potential nesting areas.
  • Traps and Baits:
    • Set up traps or use baits strategically in areas with high mouse activity. Consider the placement of both snap traps and humane traps based on your preference.
  • Professional Extermination:

How To Prevent Mice

Preventing mice infestations involves adopting proactive measures to make your home less attractive to rodents:

  • Maintain Cleanliness:
    • Eliminate food sources by storing food in sealed containers, cleaning up crumbs promptly, and securing trash in rodent-proof bins.
  • Organic Solutions:
    • Employ natural deterrents like peppermint oil or mothballs to discourage mice from entering your living spaces.
  • Outdoor Maintenance:
    • Keep the exterior of your home well-maintained, trim vegetation, and store firewood away from the house to reduce potential hiding spots for mice.

What if Mice are in My Air Ducts & HVAC Systems?

It’s probably the last thing you want to hear, but if you notice any of these, you might have mice in your HVAC system:

Detecting mice in HVAC systems:

  • Unusual Odors: Foul smells from vents suggest mouse activity.
  • Strange Sounds: Scratching or scurrying noises within ducts indicate mice.
  • Droppings or Nesting: The presence of mouse droppings or nests near vents signals infestation.
  • Reduced Airflow: Diminished heating or cooling efficiency may result from obstructed ducts.
  • Visible Damage: Chewed insulation and wires.
  • Allergy Symptoms: Respiratory issues may arise from airborne contaminants released by mice.

So, what do you do? Start with:

  • A Professional Inspection: Hire a professional pest control company FIRST and then an HVAC technician to look at your ductwork.
  • Rodent Removal: If mice are present, professionals will employ appropriate methods to remove them safely. This may involve traps, baits, or other targeted extermination techniques.
  • Duct Cleaning: Consider professional duct cleaning services to eliminate mouse droppings, nests, and contaminants. This helps improve indoor air quality and prevents potential health hazards.
  • Sealing Entry Points: Identify and seal any entry points that allowed mice access to the air ducts. This prevents future infestations and protects the integrity of your HVAC system.
  • HVAC Maintenance: Schedule regular HVAC maintenance to ensure the system operates well and to address any damage caused by mice. Replace or repair compromised components as needed.



What does mice urine smell like?

Mice urine emits a distinct ammonia-like odor that becomes more noticeable in confined spaces, often signaling an active infestation.

What size are mouse droppings?

Mouse droppings are small, resembling the size of a grain of rice, making them easily distinguishable from larger rodent droppings.

Rat vs. Mouse Poop

rat vs mouse poop vs rice

Rat droppings are larger and more cylindrical than mice’s smaller, rice-sized, and pointed-end droppings.

What color are mouse droppings?

Fresh mouse droppings are typically dark brown to black, but their color may lighten as they age.

Why do mice poop everywhere?

Mice tend to scatter their droppings widely to mark their territory, communicate with other mice, and navigate their surroundings.

Are you tired of these unwanted guests crashing your home? Talk to Nick and Eric from My Organic Turf! Our science-based approach keeps kids and pets safe while effectively dealing with rodents.