I have 2 big 10x20 pens-- they are portable and can be moved if needed, very handy if you're renting. I have a smaller one for my puppies. we put plastic lattice over the tops and latched it down with cable ties just in case of hawks. we live in the country so we have to be careful. they love to play out there, we put some plastic lawn chairs and toys and dog houses and they really love it, they stay out for a couple of hours on nice days.
