Found Droppings or Saw a Mouse? Here's What You're Actually Dealing With.
Not every rodent is the same risk. Knowing whether you have a house mouse or a deer mouse changes what you should do next — and how cautiously you need to approach cleanup.
Identify the Droppings
Mouse Poop vs Rat Poop: How to Tell the Difference
ReferenceMouse droppings are 3–6 mm; rat droppings are 12–20 mm — about the length of a pencil eraser. Size settles it fast, but shape and location help confirm which animal you're dealing with.
What Do Mouse Droppings Look Like?
ReferencePointed ends, dark brown, roughly the size of a grain of rice. How to confirm what you're looking at — and tell mouse droppings from rat, cockroach, or lizard droppings.
Identify the Animal — and the Risk
What Diseases Do Mice Carry? Health Risks from Rodent Infestations
Check before cleanupHouse mice, deer mice, and rats carry different diseases through different routes. Hantavirus is the most dangerous. Salmonella and LCM virus are more common. Here's the full picture of rodent-borne disease risk.
Can Dogs Get Hantavirus?
ReferenceDogs don't get Hantavirus Pulmonary Syndrome and aren't recognized carriers. The real concern is indirect: dogs that catch mice or disturb droppings can create exposure risk for their owners.
Can Pet Mice Give You Hantavirus?
ReferenceStore-bought pet mice are domesticated house mice and do not carry hantavirus. The virus you need to worry about is carried by wild deer mice, not domesticated pets.
Which Animals Carry Hantavirus? A Species-by-Species Answer
ReferenceSquirrels, chipmunks, rabbits, and bats do not carry the hantavirus strains that cause HPS in the US. Find out which animals actually do — and which ones you don't need to worry about.
Which US Rodents Actually Carry Disease — and Where They Live
ReferenceMost US rodents won't make you seriously ill. The ones that can are geographically concentrated. Which species carry what diseases, where they live, and what that means for your actual risk.
Can House Mice Carry Hantavirus?
Check before cleanupHouse mice aren't the hantavirus carrier — deer mice are. But that doesn't mean house mice are harmless. What they do and don't carry, and why it still matters for how you clean up.
Deer Mouse vs House Mouse: Key Differences and Disease Risk
ReferenceThe difference is in the belly and tail — white underside, two-toned tail means deer mouse, and deer mice carry hantavirus. House mice don't. How to tell them apart before you start cleaning.