I use a drag chain, 4ft long and 75lbs that dog pulls it as long as hes out side, Hooch had it on him when he hit the bull and I used to use it to wrap around like a harness with some saddle hide southern engineered to cover the chain and pad the dog, so Hooch could wear it while running and hurdles aka round bell rounds as I called it 24 rows down and back down and back... Hooch was so strong he pull that chain through a 1/3 acre pond and could pull a 1500 Chevy scotsdale pickup 50yds, he was ripped fuel litterally. I use the same chain on Hoagie and for Turk as well; Im Old school, I like the sleds,, but a thick link 75-100lbs chain 3-4ft long is superb get your 4ply collar and thats all you need.. Hooch toppled almost everything he encountered with that damm chain on him as he rain 140 acres + back in Nowata days.