I have both the pop up playpen
Amazon.com: Best Pet Folding Play Pen - Medium -...
And the iris ex pen with two extra panels
Amazon.com: Iris CI-604 Indoor/Outdoor Plastic...
As a perment ex pen I would go for the iris. It also folds.
The pop up one. Is only good for traveling. I took it to my moms. I would not trust it for everyday. It would not stand up to puppy abuse. Galen already made a hole I have to sew.
Here is a cover for the iris ex pen. I ordered it I did not get it yet.
Amazon.com: IRIS CI-604 Mesh Roof for 4 Panel...
I hope this helps. Btw Galen is about the same weight and age