I suggest you find another trainer, as he obviously doesn't have a clue. Just because your dog barks doesn't make him aggressive. My dogs bark at strangers when they first see them behind a fence, but if I let them in they would come for a pat. If I weren't home, my rottie would probably attack an intruder, which is normal behaviour, but I have a sign on my fence so it's their problem if they're dumb enough to enter. I still wouldn't regard her as aggressive as she is really polite.
Originally Posted by MowieandRissa
Aggression is a tad bit complex just to label any barking dog with it
Respect and you shall be respected. Animal is always right.