Sonic pet trainer. This commercial just came on. Apparently, if your dog or cat is on the counter, is barking, is disbehaving in any way, you press this thing and they instantly become …happy? compliant? it weirds me out.
Is this harmful?

If it’s just a tone that dogs hear that people don’t, you have to train the dog to know that the tone means they’ve done something bad. Otherwise they just hear it as a sound with no context. Same as with the clicker devices - you have to teach them it means something positive or negative.