My chihuahua loves this pen.. He feels like it's his own room. He can go in and out of it on his own thanks to the handy gate.
However, I wouldn't recommend leaving your dog in the pen while you leave the house. It's so lightweight, my chihuahua can easily lift up the bottom using his *nose*! I've had to weigh it down to stop him. He can also climb right up the side. ((Now I keep him in the bathroom when I leave the house.)) Otherwise, it's perfect for us.