Actually, the best way to break a bite or fight is grab the aggressive dog by the hind legs, haul its arse off the ground as high as you can and “twist”, thereby kicking in its cerebral “gyroscope”.
NO dog likes being off balance and that will instantly snap its brain out of attack mode into self-balance mode.
The second key is *always* carry a small, spare leash in your pocket.
[mine is a 4 foot 3/8” flat braided nylon one...it wads up into a tiny ball in my pocket]
If there’s no one there to help you, quickly loop the spare leash around the waist of the attacked dog, tie it off to ~anything~ handy and then get -behind- the attacker and do the “wheelbarrow” maneuver while pulling away from the tethered dog.
It has the added advantage of keeping you *out* of bite reach of the “wheel-barrowed” dog.
Shotgun is much better.
Shotgun is much better.