We were very impressed with how well the pen was built and how much room our 10 lb maltipoo puppy had inside once it was put together.  Enough room for his wee wee pad, a water bowl, and room to play with his toys.  Unfortunately, within a day, he quickly learned how to climb the walls and escaped.  It didn't work for long, but if your dog isn't a climber, it's a very well constructed product that will be a nice place for your dog to stay while you're away.