Sorry to hear about this, not really the same but I have been involved in an incident before with our old dog (Sam, golden retriever) and a person not another dog.
Please note Sam was not a vicious dog, granted he was massive for a retriever yes, mostly just a loveable big mound of fur that was very playful but also protective of his home, due to this we had a sign up on the gate "Warning Large Dog", and he always wore a muzzle when out. This was not because we thought he would attack anyone, but to remove the possibility.
We used to have a cleaner (well not for long after this), One day the doorbell went and she opened the door (and she didn't restrain Sam, still not sure why she thought she should answer the door anyway as I was in and it wasn't her house) and a hand with a catalogue was thrust at her by a betterware salesman. Sam (who had been sleeping by the door and the doorbell woke him) took offence to this unwanted hand in his territory and promptly attacked the salesman and bit the guys arm, the cleaner was going mad, the betterware guy was swearing a lot and bleeding quite a bit with a dog stuck on his arm. I got Sam off him and put him inside, made a temp bandage with a teatowel and offered to drive him to the doctors, he refused and walked off informing us he was calling the police (he had to have stitches in the end as it was quite a nasty bite). The police came round and were fine really, they just informed us he had made a complaint, had stitches and was pressing charges and for Sam to be put down.
He then took us to court, fortunately the judge sided with us as we had a sign up outside warning of large dogs and Sam was only protecting his territory, after explaining that he always wears a muzzle when out and the sign had already been there for years the judges verdict was to make sure he had muzzle on all the time when out walking and always on a lead.
Unfortunately Sam was put down a couple of years ago due to stomach tumours

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Enough wittering on it was just to point out that dogs are animals, and they will act like it, sometimes unexpected and out of character for the dog, it is just better to be safe and not sorry when out and about (ie make them wear a muzzle), especially if you have a dog that can potentially inflict a lot of harm if it does have a moment.
This is not aimed at you Gilly, but the guy whos dog bit yours, if it was wearing a muzzle it might of growled and barked a bit (as much as it could) but that would have been the end of it.
Excuse the length and babble of my post (late, bit of beer/vodka so don't expect quality grammar or punctuation

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