Dogs are far more resilient than your average human. I own two and have had eight on total plus a brood of puppies. Never needed to resort to an electric collar however I know someone who has, he had a Jack Russel who kept running under his gate and into traffic, he tried everything to stop the dog doing it all to no avail so he resorted to a collar, within a couple of days he had the dog under control with a combination of a short shock and voice he was able to stop the dog in its tracks which probably saved its life. I would like an updated version to apply to some humans, now that would be a good thing.