I moved the pups to the middle outside pen since they absolutely hated the small pen. We put the plastic snow fence over the top of the pen so that owls and hawks and other raptor type birds would not be able to swoop down and steal a puppy. This pen is much larger and a lot more fun for the pups. There is tall grass to do twirlies and zoomies through and they have a lot more room to run and romp. There is a big hole being excavated under the shelter too courtesy of Callie. The boys love it - it's like a cave. I will have the Pupcam pointed at this pen when they are in it.