Here's what a deer mouse looks like. You should take precautions around all rodents. It's not always easy to tell if the critter you're dealing with is or isn't a deer mouse. The deer mouse is about six inches long to the tip of its tail. It is yellowish brown to grayish white on top, has a white belly and feet, large ears, and a furry tail that is white on the underside.
Deer mice live in all parts of Washington, but mainly in rural areas.