I've stopped a lot of dogs that go through the stare down and warning routine with the handle end of my leather 6' leash. Keep your dog on a short line and pay out the rest through your right hand. You can swing it really hard and flank the dog or hit it in the face. Very few dogs are going to make it through that and keep fighting.
When a dog saves the life of a man, it becomes clear that partnership knows no bounds.
Fama - T.E.D.D. OEF XI-XII (GSD)(RET)
Marshall - T.E.D.D. OEF XII-XIII (Lab)(SF EDD)
Lucian - Med Alert / Mobility SD (Cane Corso)
Pud - the old man (Pit x Lab)