The best way to prevent rats and mice inside is to pinpoint how they’re getting indoors in the first place. Rodents are known for their ability to squeeze their way indoors very easily. Small house mice can fit into holes that are just 5 mm wide, making any tiny crack or crevice a vulnerability. Rats, on the other hand, are known to climb nearby trees and trellises to get to the roof of your property. From there, they can enter through soffits, vents, and any other opening that is larger than about ½ inch. Some rats, like the Norway rat, will burrow beneath your property and get indoors that way.