Yah! Vee must get zeese kinder into an organization zat veel toughen zem up! </sarcasm>
Seriously though, elementary school age kids are soft, and sweet and huggable. Very easily damaged. The principal was probably going out of his way to avoid using the words "dog bite".
Dunno. When I was just a itty bitty thing, if I fell down and smacked the sidewalk, my dad would rush over to make sure I hadn't cracked the sidewalk so he wouldn't have to pay the city. It worked on me, and it's worked on my kids. "Walk it off" is not a bad thing. Life's tough and kids need to understand this.
They're also fearless, indestructible savages. Or used to be. And I'm not just referring to those ancient days when I was a lad.