Touching on that subject. I was walking one of ours the other day, granted he's not the best, bit of a rogue when he's out but it's forgiveable considering he's spent 3 of his last 4 years in kennels; he is improving slowly. He doesn't get off the lead at all due to his current love of doing a runner. Anyway i digress. A lady with two dogs leaves her house as we approach. I stop and casually shorten the lead length to prevent any incidents, I'd not seen these dogs before. She in all her wisdom allows her dog to get to mine despite seeing his behaviour and then remarks on how nasty mine is when he snaps. The point I suppose I'm trying to make is that a persons perception of what is and what is not nasty behaviour makes a big difference to any outcome and much of what is described as aggression is nothing more than a warning, something dogs understand but very few owners can relate to.