Yes, I would suggest a prong collar for this issue as well as our Loose Leash Walking course. My parents raised Rottweilers for many years. Wonderful dogs, but SO strong. The more he practices pulling on the leash, the less sensitive his neck will become, so I would definitely work on this now.
For structured training sessions, the Herm Sprenger prong collar is going to be more effective than the Keeper Collar. It has more "action" than the Keeper. I also recommended the Keeper Collar because you were concerned about the reaction of people in your area.
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