I use a extending lead, and I've not had any problem, the first time he ran into the wheel going slowly since then he's kept about a foot off it. My dog sniffs a lot so if you slow down to turn, his nose is in a hedge and he's cocking his leg shortly after. Also he does his business after a bit of exercise so I've got to watch out for the signs or he just stops and does it anyway, and he's like a 32kg anchor. Hope this helps
Atb
Baz