Prong Collar

This one of the most controversial collars on the list here. It is similar to a martingale except the main loop that goes around the neck is made of prongs, which when pulled poke the dog, somewhat stimulating a bite.

Pro: Useful for severely aggressive dogs, hyperactive dogs and heavy pullers.
Con: Misused in Dog Fights by opening up the prongs to cause needle-like pain.

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