A DOGS NOSE IS MAYBE THE MOST SENSITIVE PARTS OF IT'S ANATOMY AND IS THE DOGS ESSENTIAL SENSE WHEN WORKING IN THE DARK, A FLICK OR TAP ON A DOGS NOSE WOULD BE LIKE A FLICK OR TAP ON YOUR GONADS AND WE ALL KNOW HOW SORE THAT IS, HITTING A DOG DOESN'T DETER IT, IT JUST ALTERS THE DOGS PERSONALITY.
I agree that hitting a dog hard on its nose would change it's personality but when I said "smacking" in meant to give it a short sharp shock - as Col_c88 said, to take its mind off something. It was absolutely nothing to do with beating a dog or punching as you put it.
I dont know about yo