Shock & prong dog collar "training" methods are unethical, and can be harmful to dogs, and are usually a quick fix to a dogs seemingly "bad" behaviour. Negative reinforcement doesn't support a dog to live a happy and fulfilled life, in the same way that it would not support humans.
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Shock & prong collars used on dogs can be harmful and amount to abuse, and can enforces fearfulness and may even make dog's behaviour worse. Lack of awareness of how much harm rather than good these collars can do is shocking. Positive reward based training has a much higher success rate than any fear based training, and the effects are almost immediate.