Sorry to here about your dog. Just shows that the sooner people stop letting their dogs off leads when there are other dogs about the better.
You might think you can control your dog, but you can never tell how someone elses dog will react. Whenever I used to take my dog out she was muzzled and on a lead. Even so, she'd try and go for other peoples dogs that came near her which would always result in angry shouts in my direction. Just because their dog is "friendly" they assume everybody elses dog wants to be their delightful creatures friend...
You might think you can control your dog, but you can never tell how someone elses dog will react. Whenever I used to take my dog out she was muzzled and on a lead. Even so, she'd try and go for other peoples dogs that came near her which would always result in angry shouts in my direction. Just because their dog is "friendly" they assume everybody elses dog wants to be their delightful creatures friend...