Our ferrets have a cage that is 5' tall and 3' square. It's huge. They have an upstairs where their food/water and blankies go. There are ramps and tunnels that take them up higher and they can sleep in hammocks suspended from the "roof". They can go to the downstairs, again thru tunnels and ramps to the "basement" which is entirely covered with litter so they can poop in any of the 4 corners. When they are out running around the house they will run back and hop into the cage (the basement) to go potty. This basement conversion was done cause more often than not they missed the litter boxes and I was cleaning the whole bottom anyway. The cage was expensive, but the boys have to be in it all day while am at work.