Very cool working dog! Though I do wonder what impression it made on some of the kids. While we see a very well trained dog, kids at that age that may have already been slightly nervous around dogs might just see a dog biting a person and be more afraid of what a dog could do to them.
I personally would have brought in a dog to do an obedience routine or even canine freestyle. Both show clearly how driven a dog can be to perform and how much training can do for your dog, but don't involve biting.
Either way, my thoughts - great performance!
-GoingNowhere