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I got an extra box of grids and an 8' tarp, a couple of boxes and some sections of sewer piping. I zip tied the grids together in a line. When it's playtime, I put the dogs in the car (their favorite place in the world!) put the tarp down, toss some old towels over it and set up the joined grids in a circle, and attach the ends to each other with a carabiner clip. I can set this up nearly anywhere, they're safe and can't get anywhere unexpected, and cleanup is a breeze - give any wet spots a wipe, roll the towels/tarp up, take outside and shake out, fold the grids back up accordion style, and it's over with. In nice weather I do away with the towels/tarp and set up the pen under a shade tree on the lawn (they're still not used to the great big world yet but they do like hiding under a box and nibbling the fresh grass!)