Slip collars (commonly called choke chain or check chains) are made of metal links or rolled material such as nylon or leather. A metal ring is at each end. Historically, slip collars have been used as a matter of course, mostly in North America and the UK. In the last few decades use of these collars has declined. Correctly used, the collar should make a quick clicking not zipping sound when quickly snapped and released to startle or get the attention of the dog and indicate to the handler that the technique was a swift jerk not a choke. The idea is not to strangle the dog, though this can happen if the collar is improperly used.
Most training schools are happy to allow you to attend and observe (leave Fido at home for this) a class or two to be sure the style of instruction fits with your beliefs. Dogs learn best through progressive reinforcement training; rewarding the dog for making the right choice and withholding rewards, or ignoring the dog for making an incorrect choice.
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