We're building our run now, and I have read about the importance of hardware cloth along the bottom of the run (as well as an apron). Where we live in suburban VA, we have foxes, raccoons, possums, and probably skunks. I bought a dog pen to put on top of our foundation- the holes are 1.75 x 3.75". Obviously, these will be covered along the bottom. Do I need to hardware cloth all the way to the top with these holes? Thank you.