[header] How to choose a cage for a ferret [title] Determine the size you need. [step] The size of the cage depends on the number of ferrets you plan to own. A single ferret needs a cage that will allow space for one bed, one litter box, a food dish, and room to play. 
More ferrets will need room for more beds, food dishes, and play space. A good cage should be at least 30 to 60 inches (76 to 91 cm) long , 18 to 24 inches (46 to 61 cm) wide and a minimum of 20 inches (51 cm) high.