Poorva's interesting experience is worth sharing. Hence repeating her comment as a post. This is what she wrote from Texas:
I too had a brush with death when another "guard dog" took upon himself to protect his master!!!
My father and I were dragging an old cupboard out of the gate, when our neighbour's dog decided that we were tresspassing! He bounced towards us making a horrible noise which I suppose was a growl! My father was nearer to the entrance and had to defend himself. So he let of the massive cupboard which evidently slammed into the ground and after I broke its fall!
My father is 6.2 feet tall and when the dog jumped up, he was almost as tall as my father!
Mercifully our neighbor was watching and came running and stopped the dog by just tapping his tail! Alsatian's jaws snapped inches away from my father but thankfully he was unhurt! I ran away yelling...frightened to the core!
I ended up with minor bruises and a severely hurt ego :P!!