Rat Droppings vs Mouse Droppings: How to Tell the Difference

The quickest way to tell rats and mice apart is by their droppings. Rat droppings are large — about 9–14mm long, roughly the size of a raisin or olive pip — dark, with blunt or slightly tapered ends. Mouse droppings are much smaller, around 3–6mm, thin and pointed like a grain of dark rice. Knowing which you're dealing with changes how the problem needs to be treated.

Rat droppings

• Size: about 9–14mm long, noticeably chunky.
• Shape: spindle- or sausage-shaped, with blunt or slightly tapered ends.
• Where: often grouped near walls, along runs or by food.
• Number: fewer but larger — around 40 a day per rat.

Mouse droppings

• Size: about 3–6mm, small and thin.
• Shape: like a grain of rice with pointed ends.
• Where: scattered widely, including drawers, cupboards and along skirting.
• Number: lots — a mouse can leave 50–80 a day.

Fresh or old?

Fresh droppings are dark, soft and slightly shiny. As they age they turn grey, dry and crumbly. Fresh, dark droppings mean the infestation is active — act quickly, as both breed fast.

A quick word of caution

Rodent droppings can carry bacteria, so never handle them with bare hands or sweep them up dry. Ventilate the area, wear gloves, dampen with disinfectant, then bag them. If you're finding droppings regularly, get a professional to identify the entry points and clear it properly.