I was hoping to get some product recommendations for litter tracking mats. I have two litter boxes for my two girls (one covered for Tattoo and one uncovered for Rae) and they both manage to track litter out of the box for several feet no matter what kind of litter I use. I've tried putting a towel and an area rug down to catch the litter so that I can just dump it outside/in the trash, but they like to pull them up when they are burying and they don't work anyway. I would like to buy a special mat designed specifically for this problem, but I have no idea which type to buy. Several I've seen look like they would bother my kitties paws. Any suggestions or stories you can offer would be greatly appreciated.