Training and containing your dog doesnt require distress or discomfort. Period.
The problem is, many dog owners have little understanding of animal behavior or training, poor animal behavior-observation skills, and bad timing. When you put a tool that works by causing pain in their hands, the result is often poor. Those who consistently hurt sensitive dogs or inadvertently punish dogs when they are doing the right thing are likely to produce dogs who resent and/or fear their handlers and/or walking on leash. Handlers who are uncomfortable with or not strong enough to hurt their dogs with these tools almost always end up with dogs who continue to display deplorable behavior on leash those dogs who just pull right through the discomfort of a tight, choking or pinching collar but who are also now stressed and anxious about this continual discomfort.