We live in a house that is 1/2 mobile home and the mice get in through pipe inlets, I assume, that we cannot reach to plug. (Never have had a problem in a stick-built house, as long as we had a cat, so I'm convinced after many years it really is all the elusive "holes" in trailers.) We have cats now, but they can't get to the mice! They catch mice outside, but just prowl, or sit and sniff at places inside the house where they can smell them, but CANNOT reach the varmints. SIL is a vet and has treated many pets for DCon poisoning (usually unsuccessfully) after they pick up a dead or dying mouse, and I just don't want to take the chance. Any ideas? Thanks.