Bronson got attacked this morning by another dog on our walk, so what I want to say is... If you know you've got an aggressive dog that doesn't get on with other dogs, then do something about it to correct this behaviour, don't just constantly warn other dog walkers/owners, then let your dog go for every other one that goes near it. Your dog is your responsibility and it's behaviour/aggression is a reflection of your attitude to life. Would your let your child go round attacking every other kid it sees? No, so why is it acceptable to let a dog do it?