Look at the below photos.
Roof rat droppings vs mouse droppings.
Roof rat droppings are very similar to the house mouse but much thicker.
When rat droppings are fresh they are soft and dark and feature a shiny wet surface.
They are different sizes.
Rat droppings are bigger than mouse droppings and measure around 3 4 th of an inch in length and around 1 8 th of an inch diametrically.
They may be of different forms or sizes.
Norway rat poop droppings norway rat poop droppings are even thicker that the roof rats and typically much shorter than field mice and roof rats.
In comparison to rat droppings they are small with either one end pointed or both ends pointed.
Medical articles and infographics.
But a rat pellet is way bigger much fatter with rounded ends.
Mouse poop far right is much much smaller than rat droppings.
You can see that a house mouse turd is like a small grain of rice even smaller than that often with pointy ends.
Droppings from the roof rat middle is a little smaller than the poop from a norway rat and has tapered ends.
Droppings are typically found around where these creatures eat.
Rodent feces can carry harmful bacteria diseases and viruses including the hantavirus.
Rat or squirrel droppings.
Droppings from the norway rat closest to the penny is the largest of the three and has blunt ends.
A norway rat has capsule shaped feces while a roof rat has spindle shaped droppings and a house mouse has rod shaped excrement.
With that being said the easiest way to distinguish between rat and mouse droppings is to analyze the size of the droppings and their shape.