he get's to swim without the prong collar, and i take a look because i wonder why this dog is in what seems to me a torture device like they use on prisoners or slaves. i find this, instantly, on a veterinarian web site:

1. They’re inhumane. Despite what your trainer or pet store employee may say, driving metal prongs into your dog’s neck hurts. That’s exactly why they so expediently stop a dog from straining at the leash, for example. Although eliciting pain may provide a quick fix, the effects are often short-lived.
2. They’re no substitute for a positive training style. Too many pet owners employ this tool as a substitute for a more positive type of training. Inflicting pain is an expedient, inexpensive approach, but it's often less effective than the basic obedience training that too few dog owners are willing to undertake.

the guy asked me years ago when the dog was an aggressive puppy how to make him peaceable, and i tried to explain, but i think i basically said, love, and socialization. but if the problem with the dog is the same with you, how can i explain. years later, nothing has changed for him and the dog. the dog is still menacing, still controlled, the guy is still opaque, inscrutable and coercive.