hey all i am building a pen right now as we speak my dimensions are 5ft overall height the with is 4ft the height between the ground and the floor of the pen is 1ft . the overall length is 8ft the open walk around area is 64 in. the 32in left is for the enclosed area witch is for the female who breed to deliver the pups or for the shelter of the rain. If any of you guys got cal jack book you can build a pen like his witch i kind of took some inspirations from but changed dimensions on different parts of it but will post pics of very soon please guys post your for me and elaborate on why you build it that way and what materials you used