Join Date: Jun 2017
Location: middle of nowhere
You have to get your stuff out of there. Go over the trailer's tack room with a fine-toothed comb and seal up any tiny area where they could be getting in-- roof vents, little gaps along the door, drainage holes, gaps in the floorboards, etc. Mice will get through a very tiny spot. Once you have sealed up the tack room and trapped any currently residing rodents, carefully go over your items and tack. Dump out buckets where they could be hiding, put grain and treats elsewhere, etc. Put only what must be in the trailer tackroom in there. Keep an enclosed trap in the corner, just in case. Throw away anything contaminated with mouse poop and urine-- it can carry several diseases, including hanta virus. If you can't completely seal up the tack room, I wouldn't keep anything of value in there longer than it took to haul to a ride. Get a tack trunk or garden storage shed instead.
Peppermint will help deter mice. I have jars with peppermint-soaked cotton balls in them in my trailer tack room. So far so good. But I don't keep feed, treats, or items not frequently-used in there, and I go through every few months, take everything out, and reorganize.
The most important thing is to seal up anywhere they can get in, and then be careful not to leave the door open or have all sorts of stuff in there for them to hide in if they do get in. They WILL chew and destroy your tack.