Fair enough question. :D
I would not tell anyone that they must use a check chain.
It is just one of many options to train a dog. The goal of any contol divice should be to be able to wallk the dog under contrtol
without a lead. (since it is law to have one on in public that would otherwise mean a loose lead)
A check chain works by telling the dog the lead is about to tighten, it should learn to react to the sound of the chain before it actually tightens.
In untrained hands a check chain will not work and could cause the dog to hurt itself by pulling against it.
This can be same with a soft training colar as it can still constrict tha airway and blood flow.
A Halti works by closing the dogs mouth so it cannot breath through it's mouth, since this is how dog cools down it is possible for an overexcited dog that fails to respond to the divice can start to overheat.
Any device used to control a dog rather than train a dog shows a lack of understanding and can be detrimental to the dog.
Quote:
I am not saying 'use a check chain' just don't be so quick to judge those who do.
:)