A Harlequin Rabbit requires enough space for it to grow, sleep, and play. When it isn’t hopping around your home or garden, you’ll want to keep your Harlequin Rabbit in a cage around 3 feet long and 2 feet wide. That said, the larger the cage, the better, as Harlequin Rabbits are quite a large breed and will take advantage of all the space they can get.