Hi SavvyCat. Is anyone living here experiencing allergy symptoms? When water spills inside, under wood or carpet, especially unclean water, it is a perfect breeding ground for mildew or mold. ASAP after a spill, pull carpet back from tack strip at perimeter, blow heated air or just air (box fan) until dry, re-attach. If to late, may need bleach solution.
Put a new mouse/rodent bait in space, check on after 2 weeks. Dead critters smell for a few days, then nothing. (They slowly decompose or dry.) They look scarier but they are a lot quieter.
Small your carpet up close- the nose knows! Be safe, GBR