This product has been a lifesaver with a new puppy in the house.  He sleeps in it every night and is there for time outs as well.  Now that he's 11 weeks though when he jumps his head comes over the top.  So with the cats in the house we now run the zipper around the cover and they are safe from each other.  With a Shih-Tzu it's the perfect size.  The only thing that kept this from being a 5-star is that it's advertised as having a place inside to hold a food bowl.  Well, it doesn't, and a call to the company immediately revealed that they came from the manufacturer that way and the box has to be changed.  The woman was very nice and took the information to pass on to her product development department, but I'm not so sure that means a thing.  But all in all, this is the BEST thing I have gotten for this new puppy so far!