I have a simular problem with the cats digging in the ferret's litter boxes. My solution was to use only a thin layer of litter in the boxes. Ferrets don't cover up so the don't really need the deep fill that cats need. Just enough to suck up the wet. We also have lots of boxes for the ferret so any one box isn't really used too much. Then change the litter more often. It is very unrewarding for the cats or ferret to dig in litter that is only one stone thick. The ferret does like to dig in the cats litter box which needs to be filled deep, but that is a different problem! Don [Posted in FML issue 1253]