Is it a space issue or something else preventing you from taking them to another room ? Setting up another bunny proofed room would probably be your best bet . Even if it ' s the bathroom or kitchen two easiest rooms to proof . Or a hallwaylanding , if you ' ve got one . If you have a pen , to prevent the cat from seeing the buns use some big towels or blankets to cover the walls of the pen . I did this to stop my aggressive bun from attacking another bun when they both had to share a room . Use pegs to keep it on . Peg it up like a hedgehog if you have to . If you ' re there to supervise and prevent the cat from climbing into the pen , this might be enough . You can also get pen covers for a lot of them , but that means having to have the pen in the specific shape of the cover . Or there are things like these covered , fold away material puppy pens 303 pfid 70129 currently out of stock here . black Friday sales I guess . They come in all sorts of sizes so have a poke around on Google . But if your buns are chewers you might want to reinforce the insides with some cardboard . How big are the cages ? You could for now buy larger cages . Pets At Home had some huge 6 foot cages but I can ' t find them on their website now .