I trained my CRAZY dane puppy with a leash and a prong collar. she was like a whole new dog with it on… you may consider doing it the old fashioned way, rather than confusing the dog with a zap when he’s already used to chillin in the road… he’s not going to realize that he’s doing something wrong…he’ll just be like wtf is going on… (I went to doggie school for 3 dogs so i know all about it if you need help)