When you say thick dog collar I am assuming the 1" or so nylon kind. Our goats wear those most of the time, but for show or setting up we use a chain 'choke' collar, we never use the choke part at all. Just the thinner metal gets their attention better than the wide soft nylon - of course your hand gets equal treatment, lol. When just teaching ours we leave the nylon collar on lower down. I have seen people show the bucks with the prong sort of chain dog trainers.
hth
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