Very happy with the pen pen.  We enclosed this in a long rectangle of 2' x 6' and used clothes pins to clip an old sheet over the top.  We are out of town working and renting an apartment.  We can put the dog and cat inside while we are gone and there is plenty of room for a potty box (which they both use), food and water dishes and a sleeping area.  The pen comes with the hardware clips to keep the entire unit secure on the ends and if you want to use it outdoors it comes with the stakes to secure it in the ground.  [...]We are happy with our entire purchase experience.