You definitely did the right thing by not screaming at shouting but instead remaining calm. Dogs take their lead for the owner so things could have been a lot worse if you didn't react that.

It's a real shame that something like that has caused this reaction. I can't say for sure whether you will be able to train the vicious streak out of him or whether it will go away over time. You could always try to introduce it to other dogs within a controlled environment, and build it up from there.

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