After being zapped by one of these myself, I had to tone down my disapproval of them. It was uncomfortable but not particularly painful, similar to a 'handbuzze

After being zapped by one of these myself, I had to tone down my disapproval of them. It was uncomfortable but not particularly painful, similar to a 'handbuzzer' gag gift. My bigger problem was that it was not very effective at stopping barking.