I found mice droppings? My house is really clean but I found mice droppings within my...

My house is really clean but I found mice droppings within my spare room under the fitted sheet on the mattress and contained by my bedroom on my night stand....ewww i'm freaked out....how do they capture this high????? What is the best route to get rid of them? I own 2 dogs that get everywhere so I'm a moment or two hesitant to grasp traps....what should I do/?? Please any help is appreciated I enjoy never had mice up to that time and I am freaked out
Answers:    Mice like peanut butter. And mice are fitting climbers. Get a live trap and put peanut butter bait inside. Then just put it surrounded by a corner where the dogs can't stick their proboscis.
They have those "no see" traps that trap the mouse inside so you don't enjoy to see or touch it. Your dogs should not be able to obtain into those.