[header] How to care for a ferret [title] Select a cage that is at least 18 " x 18 " x 30. [step] " this is enough room for a single ferret. If you get another one, then you'll need a slightly larger cage. 
A wire cage works the best, as ferrets have a tendency to chew through wooden bars. Some cages are bi-level and come with specialty ramps and spots to attach a hammock.