Ferrets are notorious escape artists, so it’s important to choose ferret cages that are secure and can be locked. For a small ferret cage, we recommend a well-ventilated one with a minimum size of 24” L x 24” W x 18” H. A larger ferret cage size of around 35” L x 25”W x 55” H is ideal since these active animals require lots of space to exercise to lead a happy, healthy life.