I have a Best pet folding play pen for Galen. I had the medium. I would either get the medium or even the large. I was putting his pee pad holder in it ( he needed it cause he rips them up) I would get a large. Little more space to move. This is the one I got. But there is different sizes and colors. It folds up nice and flat.
Amazon.com: Best Pet Folding Play Pen - Medium -...