I suggest you use chain link fencing and bury it by digging a trench, two feet down and two feet out, and place the wire in it.. I would cover the entire run, including the top with chain link fencing!. BUT I Have seen dogs chew thru chain link fencing to get out so a determined pack of dogs can get in almost anything.. Electric would be a great back up or first defense! I poured a six inch deep by 24"sq. slab of cement under my run gate.. To prevent anything digging under and used 2x6 treated lumber as the frame for my gate, I placed clf and hardware cloth over the windows and gate was totally covered with both. I placed 1/2" hardware cloth 3ft from the ground up to prevent anything from reaching in.. In the four yrs before we moved NOTHING got in...and the new owner has not had any problem.. He has hunting dogs that get loose all the time, there are stray dogs that roam thru there, raccoons, fox , possums and coyotes. And I didn't have electric fencing.. A note: remember to have your gates open to the outside--this prevents animals from pushing the gate in and sliding or squeezing in...