Rats and mice are very destructive. Its always best to solve the problem immediately rather than ignore it.
All they need is a small crack and they can chew it larger to suit their needs.
Rats and mice can be flea infested carriers of disease. You may see a lot of cute pictures online, but that's not what they really look like
BUGS BEE DEAD
PO BOX 5015, Oceanside, CA 92052