hm, yeah, I agree with most of what's been said here. It's hard to tell if this dog is really an incurable biter, or if it was just being protective or confused. For instance, as I said I have a big dog at home and, if asked whether he'd ever bite anybody, I would not say "no! he'd never do that!" because ALL dogs can bite. I would just say it would be extremely unlikely because of his training.
LF hasn't been letting me post recently, it just gives an 'internal server error'... so I hope it works this time... *crosses fingers and hits button*