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Best not to drag them when they balk, just tighten lead with a little pressure on em, when they give maybe just a little to the pressure give em some slack, if you pull them they will pull back, pressure and release just like training a horse, they'll figure it out.
I connect a 50ft lead to collar. Walk away from them holding on to the lead and gradually pull them to me. Repeat this a few times until they get the idea. Works better if you have a shock collar to assist. Wish I would have been doing it this way for years. Worked great on my last litter.