We don't have a fenced yard for my beagle and lhasa apso.  The pen was a little small on it's own, but I used two old crates that were made of the same wire and zip-tied the doors open (one to the neighbors fence and one to the side of the other crate.  I then attached one end of this exercise pen to the 2nd crate and the other end of the pen to the neighbors fence.  So I was able to effectively more than double the size of the pen and give the dogs a sheltered area to hang out as well.