We just got a dog and we were looking for a way to enclose an area in the backyard for our 5 year old, 16 lbs Havanese.  This is a very versatile, easy to set up pen that we can use to either create a space for him relieve himself in during the colder months when walking is not ideal or to close off a space for him to use.  The ground stakes help keep it up and it seems pretty sturdy.  For my dog, he could definitely use a larger space if I were to use it as an enclosed pen for a longer period, but sufficient for limited use.