Does anyone else have the problem of litter box overkill? # of my cats not only cover thier waste but end up digging and digging until the litter is out of the box and the other cats will then use that litter for thier business.And 2 of the older males sometimes show dominance by leaving thier droppings un covered.Moose The Magnificent is especially good at this,and at 25 lbs you notice verrry quickly.I use old UPS delivery boxes and covered pans,but I still come home to sand dunes in the living room,any ideas would be welcome.