You heard scratching at night, or you found droppings in the pantry. The next question matters more than it sounds: is it a rat or a mouse? The answer changes where the nest is, which gaps they used to get in, and where traps go. Four rodents live around Issaquah, and each leaves different clues.
The Four Rodents Around Issaquah
Issaquah sits in a valley between Cougar, Squak and Tiger Mountains, with neighbourhoods built right up to the forest edge. That cover suits all four: roof rats, Norway rats, house mice and deer mice. Roof rats and Norway rats are the two rats; house mice and deer mice are the two mice. They share the same valley, but they do not share the same habits.
Size and Looks
The simplest clue is size. A rat is clearly bigger than a mouse. A Norway rat is the heaviest of the four, a thick-bodied ground dweller with a blunt nose and small ears. A roof rat is slimmer, with a pointed nose, large ears and a long tail, built for climbing. A house mouse is small and grey-brown with a pointed nose and large round ears. A deer mouse is about the same size, but with a white belly and white feet, and larger eyes.
You will rarely see one clearly. They move at night and they move fast. So do not rely on a glimpse. Rely on the droppings, the sounds and the nesting spot, which are easier to check.
Droppings: The Most Reliable Clue
Droppings tell the story. Rat droppings are bigger: dark, capsule-shaped, about the size of a grain of rice or larger, and usually found in smaller numbers along a route. Mouse droppings are much smaller, like grains of pepper or small seeds, and usually found in larger numbers, scattered near food. Roof rat droppings are pointed at the ends; Norway rat droppings are blunter. House mouse and deer mouse droppings look alike, so the nesting spot and the sounds matter more for telling those two apart.
Where you find them matters too. Droppings high up, on attic beams, on top of kitchen cabinets, along the roofline, point to roof rats. Droppings low down, in the crawl space, under the deck, along the garage floor, point to Norway rats or mice.
Sounds at Night
Listen after dark. Rats make heavier, slower sounds: thumps, dragging, and steady scratching in the attic or inside a wall. Mice make lighter, quicker sounds: rapid scurrying and faint squeaks, often in the kitchen walls or behind appliances. If the sound is in the attic and heavy, think roof rat. If it is in the wall behind the kitchen and light, think mouse.
Where Each One Nests
Roof rats nest high: attics, roof voids, and the tops of walls, reached by climbing trees, fences and vines that touch the house. Norway rats nest low: burrows under decks and sheds, crawl spaces, and garages. House mice nest close to food: inside kitchen walls, behind appliances, in pantries and in stored boxes. Deer mice prefer quieter, less-used spaces: attics, sheds, garages and cabins, often in stored fabric or paper.
That is why the inspection walks the whole house: attic, crawl space, garage and roofline. The nest’s height and place narrow the animal down before a single trap is set.
Does It Change the Plan?
Yes, in the details, not in the order. The job is always the same flow: inspect, trap and remove, seal the entry points, then clean up. What changes is where traps go, which gaps matter most, and how the sealing is done. Roof rats need the roofline, vents and branches touching the roof checked first. Norway rats need ground-level gaps, foundation vents and burrow openings. Mice need the small gaps. A mouse can fit through a hole the size of a pencil, so the sealing has to be finer.
That is also why identification is part of our rodent inspection: the technician does not just confirm you have rodents, they work out which one, so the trapping and the exclusion fit the animal that is actually there.
What to Tell Us When You Call
Three things help most: what you found (droppings, sounds, gnaw marks), where you found it (attic, kitchen, garage, crawl space), and when it happens (night, day, all the time). A photo of the droppings next to a coin, if you can take one safely without touching them, helps too. With that, our team can tell you on the call whether it sounds like rats or mice, and what the visit will cover. If you are still unsure, our guide to the signs of rats in your Issaquah home walks through the six signs one by one.