I use this exercise pen outdoors to keep my small dog safe when I am indoors.  She goes into the pen and have playtime without being able to leave the yard unsupervised.  It took awhile to get her use to going into the pen but she now goes in by herself. We can also move the pen to different areas of the yard.  I like the idea of the door as we can let her in and out without lifting her and it has a latch to keep door closed when in use.  Overall good product.