Finally managed to spend five minutes and at least ten calories to add hooks on the side of the dog pen, to hang up collars. Every musher has a story about dogs at play who somehow get tangled into each others collars and go apeshit and upset. So far, this has not happened here, but you never know. Far better to let the dogs play completely naked, the way the good Lord intended.
So for once, I managed to take care of prevention in stead of waiting for it all to blow up and then dish out for the cure.