This pop up play yard arrived and its perfect...it assembles (nothing to do, it literally just pops into place like magic in about 15 seconds!) I cant say enough about how amazing it is. My 55 lb. dog fits in it easily. It is very sturdy, has a door with a zipper flap and velcro to hold it open if you want, plus a zip off top with mesh or fabric. Its the best thing I have bought in a long time, and definitely the most well-made and easy to use. I am stunned at how good this product is given how hard it was for me to find, and how badly made (and how badly conceived) everything else I have tried was...Dont even consider anything else - this is perfect for your pet, especially if you want her near like I do while she is recovering from surgery, but not confined to a crate. (PS - would work for toddlers as well and nicer than the goofy playpens from Babies-R-Us!)