We have a story out of New Zealand where two dogs broke from their chains and savagely mauled an elderly man. A passer-by was able to kick one dog off and beat the other dog with the metal bar attached to the dog's chain (which was still attached to the dog). After that, the dog backed away from the bite victim.
Officers arrived and used their cars to bodily corral the dogs into a safe, confined area. They used pepper spray and a fire extinguisher to subdue the dogs enough to safely handle them.