Our lass knows the lass who's dog was killed, she had her young son with her and he saw it all.
Passers by stopped their cars to assist the lass and only when someone hit the dog with a hammer did it let go, too late though as the dog was dead.
Dogs may be domesticated, but they still have the killer instinct (as do some humans).
Luckily, it’s rare one goes postal and the owner can’t control it.