I *suppose* the sound of dogs barking could have set Saracen off, but (and I don't really know much about dogs), when Saracen came into the room, wouldn't he have been more puzzled at the lack of the dog he heard barking on his turf? Why attack a human he knows? But then, if Saracen was naturally unbalanced, it is the owner's fault for having him unrestrained around children (or anyone, really).
If the little girl did kick the dog, she pretty much had what was coming to her. It's terrible that she might have to get plastic surgery but I mean, come on, if you kick a dog...it's gonna get you back. This is a basic life learning experience if you haven't already registered that kicking people/animals is asking for trouble. And if it's a super kind, placid dog that just takes the kicking, then that makes the kicker even more nasty.