[pongeystrhjst]

Number one, do not muzzle. It's a bad image all aroung and, on hot days, can cause your dog to overheat (unless it is a basket muzzle).
If a small dog is in full attack mode and charged MJ, Murphy, and I, I'd yoke up both dogs and send that little thing flying. Loose dogs are the reason both of mine are on 4 foot leashes. I also carry pepper spray/tear gas, but I would rather kick the stupid little shit than risk irritating my dogs' eyes/noses/skin. If it's a larger dog, then, sorry MJ and Murphy, but momma's spraying the bastard.
If it came down to it, and the thing came charging and was grabbed by MJ or Murphy (when he's older) before I could yoke them up, then it'd be a combo break stick to get them out of my dog's mouth, and then a punt to get them going. An extra leash (I always have one on me) makes a nice weapon too. One good whack with the steel clasp to the head or ribs, and most dogs will reevaluate the situation and turn tail.
Unfortunately, these things just happen sometimes. It's how you handle the situation that can make the difference.