I bought the smallest size. Great size for my 2 pomeranians. My big concern is the plastic connectors seem very soft and not sure if they will withstand putting the gazebo together and taking it down when we are camping with our motor home.  Securing the roof tarp involves 2 people---1 person sitting in the pen holding up the center roof ring (plastic) and the other person securing the center roof top bolt (plastic). Overall for our immediate necessity of securing the little guys it is great. Durability on the other hand I' not so sure.