The real question is, "how do you teach your dog to stop pulling?"
Not necessary at all if one owns a pug.
Hook him to a cart and load it up with a few kids...At least then he can’t pull any faster than you can walk!
That is what I was thinking, I have a 2 1/2 year old Dobie that has pulled me on my face several times , even with a barbed training collar!
She is my fifth Dobie and I don't remember any of the others being so crazy and hard to train to the leash! It always happens when she jumps a rabbit in the hedges or a cat crosses our path. If she was hooked to a wagon load of little kids it would be bad news!