My 17 pound French bulldog fits inside perfectly. I bought this to be able to pack into my luggage and take with us on the plane as I will be travelling with my girl  (see my other review for a great in-cabin carrier) this Christmas time. I was very surprised to see how easy it is to open and close back up!  She went into it right away. I can see it would not be good for "chewers", but for those who don't chew, it is a big enough set up they can be left for a few hours by themselves, like a little "den...with en enough room for a small water bowl.  Very nicely made too. I LOVE that you can unzip the top and leave it open if you wish.   Excellent product.