Prong dog collars are used to supposedly train and control "aggressive" dogs; however, mostly it is considered an abusive device for any animal.  I cannot believe that The Humane Society would recommend the use of these torture devices shaving the fur and piercing the skin of canines everywhere.

As stated from The Humane Society's website http://www.humanesociety.org/animals/dogs/tips/collars.html : 

"Prong or pinch

The prong or pinch collar is similar in style to the martingale. The control loop that the leash is attached to is made of chain. The loop that fits around your dog's neck is made of a series of fang-shaped metal links, or prongs, with blunted points. When the control loop is pulled, the prongs pinch the loose skin of your dog's neck.

Like the choke chain, the prong collar must be properly fitted. The size of the prong links should be appropriate for the size of your dog. The collar should sit high up on your dog's neck, just behind his ears. The fit should be snug, so the prong links can't shift to the front of your dog's neck where they might pinch your dog's trachea.

More humane collars and good obedience training should make it unnecessary to resort to this aversive collar. If you insist on using one, consult an experienced trainer to learn how to properly size, fit, and use it." 

On the other hand information from "Big Paws Huge Paws" website http://bigdogshugepaws.com/choke-prong-or-shock-collars implies: 

 

"amed Applied Behavior Analysts, Marion and Bob Bailey, in the APDT Dog Trainers Resource article, the ABC`s of Behavior,make the following assertion: "Aversives in general, and punishment in particular, may have bad consequences for the dog and trainer. They can produce uncontrollable fear, not only of the trainer, but the entire training situation. Aversives can suppress virtually all behavior. They may also encourage aggressive responses. More acceptable alternatives, such as reinforcement, should always be considered before using aversives." Marion Bailey was one of B.F. Skinners (Operant Conditioning) early undergraduate and graduate students. She and her husband trained over 15,000 animals over 50 years. These wonderfully educated people were not just training dogs, they were analyzing behavior as it applied to training methods.......

Finally, Pat Miller, CPDT, CDBC, owner of Peaceable Paws, respected seminar speaker, author of multiple books and Training Editor for Whole Dog Journal, gives the following perspective in her widely acclaimed book Positive Perspectives:

"Choke chains, prong collars and shock collars utilize mild to severe punishment, called ‘corrections’ by trainers who use them, to let the dog know when she has done something wrong. I don`t recommend their use. Punishment can be difficult to administer effectively- timing and severity of the correction are critical to effective punishment training - and even when done properly there is a high risk of unintended and undesirable side effects, including aggression. ...Make no mistake however, those prongs do cause pain-that`s why they work. If you doubt that, slip one over your wrist and give it a solid yank. Then think about doing that to your neck."
Leslie Fisher Pat Miller 
Certified Trainer Affiliate 

Peaceable Paws.

Do NOT use a pinch collar or any other pain-to-neck device (including especially a bark-corrector or remote shock collar) on any dog with an aggression problem. Pain tends to in crease aggression. For dog-aggressive dogs, any pain in the neck can trigger the same fight response as would be triggered by being bitten in the neck by the other dog. So use of neck pain to a dog who is dog aggressive is likely to cause the dog to start a fight as a pre-emptive strike under less and less provocation from the other dog. Additionally, if a pinch collar or chain collar is on a dog who is grabbed by the neck by another dog, the grabbing dog may catch and break a tooth on it, which causes great suffering to that dog and great expense to whoever has to pay for a root-canal procedure."

The pinch prong collar should be taken off the recommendation list and placed on the "BANNED LIST" of items to use on canines.  Sign this petition and hopefully the recommendation of abuse in training taken off the list and sale of these animal devices are taken off the market.

 

Pic from:Amazon UK Bans the Sale of Prong Collars | Life With D​  https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTQyQCQHTHxOP1iLuz1hqQQMgpKng0ynWSw_F7vzj5K00_T0Dx9