Monitor Their Activity

In order to prevent them from getting into your house, you need to know if they are there outside your home – check for the signs of rodents nearby your home. Check your yard and see if there are any droppings, holes which have been dug into the ground, or the smell of urine. Try setting up mouse traps outside your home as well. This will give you an idea of whether or not there are any rodents lurking outside your home.