Use harnesses, not a leash, not even a collar. A harness surrounds the dog and controls all their weight at one tugging point. The dog will learn and feel as if you were holding them back. (Remember, in an alpha mindset the feel of you personally holding, touching/etc. to the dog make it learn its place). I can't stress enough using a harness. Choke chains are useless in 99% of scenarios since most people don't understand the purpose, or how to use them effectively (even though as the harness does, it teaches the dog its place of what it can and cant do when the leader of the pack tells it so).