They make pepper spray specifically for deterring dogs. I'd get some. Also, if a dog goes after your dog then grab the attacking dogs back legs and lift them in the air while walking backwards. They can't spin around to bite you and are forced away from the fight without hurting them. Stand there and shout until somebody hears comes to help you. But that's only if you don't get the chance to pick your dog up in time! It'd be better to avoid the fight and the chance of your dog running off once you've got the aggressive dog secure.
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