Mice are fine outside. Inside the only good mouse is a dead mouse. They have no sphincters and, therefore, wherever they go they leave a trail of urine and poo. Not very healthy. I live in a rural area and do occasionally get mice in the house. I have humane traps but if I catch a mouse I shake it and leave the body outside for the owls. Mice will return to a warm house. The end is quick and clean. I can't put poison down because of the owls, if an owl takes a poisened mouse it will kill the owl