ZuPreem at mail order cataloges Jeffers 1-800-533-3377 Care A Lot Pet Supply1-800-343-7680 Litter box in cage. T clamp down I use a C clamp from hard ware store. I put baby blankets in the bottom of the cage where they want to use another corner. I hold the blanket and put my sent on it first rub on my face some times, then place in extra corners. How much play time do your ferrets have??? They need lots. How about trying a diffrent litter. Or clean the box more often. Carol [Posted in FML issue 4818]