I have already built my pen with chicken wire, but I did not know I should have burried it underground to prevent predators. Now I have no more chicken wire but i do have alot of rocks on my property...so does burrying rocks around the pen works in deterring predators from digging their way in the pen?? How deep and wide should i make the rock barrier and is it better to use big or small rocks? does any of you have pictures for insparation? Thank you!!