All of these collars, known as aversive collars, are dangerous for dogs and can do more long-term harm than good. According to the Humane Society of the United States, these collars are not humane and should be avoided.;Prong collars have metal points that dig into the neck when the dog pulls. Chain, or choke, collars tighten around a dog’s neck when it pulls. They’re purported to be effective for training dogs to walk on a leash, claiming the dog will resist pulling because of the discomfort, but the potential for harm is great. Shock collars and barking collars cause similar discomfort when a dog exhibits unwanted behavior. Dogs use their bark for defense and protection, so inhibiting a dog’s bark could cause long-term mental trauma.Dogs are best trained through positive association and reinforcement. They should be rewarded for good behavior instead of punished for negative behavior. Aversive collars can cause dogs to associate going for walks with something unpleasant. What’s more, if your dog pulls because it sees another dog and the collar causes pain, it can cause the dog to be fearful or aggressive around other dogs. Even dogs that seem to tolerate an aversive collar may still be suppressing urges and ignoring pain, leading to long-term negative consequences. Patience and practice are the best training tools.;