Over the years my best technique overall is to call out "go home" in "the master's voice. Dogs are sensitive so you need to project authority rather than fear, and it can take practice (or at least confidence). Once you learn how effective it works, you'll have "mastery" over just about any dog.

Years ago my friend and I used to use our pumps as weapons, and a decent shot delivered to the muzzle was effective, but hard to deliver. then my friend had a brainstorm, and started carrying a rolled up newspaper in his jersey. This was super effective, since he didn't have to connect, just the sight of it was enough for most dogs who knew what it meant.