Boxer dog - had been wound up by owners playing with it, went for a few other kids and bit a chunk out of my arm, still got the scars.

GSD X - with an owner lying on a beach towel 100 yards off, letting her dog do what the hell it liked, I got inbetween it and my friend who was frightened of dogs, and it went for me.

Rottweiler - on the face, luckily I moved quickly! My fault, it was a 'family pet/guard dog', and I bent down and stuck my face in the way.