I have always found Boxers to be great dogs.
But this is the owners fault! :-(
You are responsible for your dogs safety, control and welfare... you must keep them under control! Others cannot give them the benefit of doubt.
This is a painful lesson for everyone who loves their dogs.
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They are fantastic dogs, very hyper and playful.
I wonder why one of those adults didn't go up and grab the dogs? I would have.