I think if you bring up a black pup in the right manner, let's say any dog to be honest, if well socialised and reared properly, its aggression and drive channelled correctly there shouldn't be much of a problem, we all have the odd scuffle now again when kennelling a few terriers, even packs of hounds that live and feed together kick off sometimes. I hope fireman worked his dog first and realised it was a coward before he pts the dog.