My cat is rather large, but still fits in the hammock.  He is still getting used to the idea of lounging here, rather than on his bed, but I think he'll end up liking it.  I am a little worried about how dirty the hammock may get.  My cat enjoys going outside, and although we've only had the hammock for a few days, it is already getting dirty.  I wish it was removable so I could throw it in the wash, but I think we'll make due.