I actually do have a X pen, and I get them out regularly. But, I also have a Siamese Cat and a Australian Shepherd. The cat I do not trust around them, but my pup loves them to pieces. I’m just worried that when they have to be up that I’m not hurting their well being at all. I’ve bought them some willow balls, and a play mat to hang up in their hutch, also I’ve put some apple stick treats, and some birch logs for chewing. I’ve only had them for about three weeks now, and I’ve been researching and learning about rabbit care ever since. It’s just sad that you really have to research everything because rabbit products can be misleading and even though they claim to be safe some are not!