Hi Ashael, I line the litter boxes with newspaper. I have 6 ferrets and only 2 of the girls will use the boxes outside the cage. Everyone else (3 boys, 1 girl) kept hitting the area beside the box. I now place paper beside the box and everyone is happy. When I did use litter it was the pellet type made for ferrets, this was too much of a toy when I changed the boxes, which was everyday, and turned out to be a waste of money for me because I was sweeping more off the floor then they were actually using. I hope this helps you. Marci Baxter, Emily Ann, Maranda, Meredith, Odie, and Spencer [Posted in FML issue 2168]