Onyx squats (thankfully he doesn't hit his legs!!), but my rottie lifted his leg. I didn't just let him mark while I was walking on leash, since I didn't want to be stopping every 30 seconds. I never corrected him for it, I just kept moving fast our whole walk, and didn't give him time to sniff or mark. I did stop in 3 places on our normal 5 mile walk for him to mark...and he got quite excited whenever we got close, but he knew that was the only time he was allowed.