It's possible meeting up with the aggressive dogs was a scary/traumatic event for your pup... but right now, nothing he does is set in stone. I'd highly recommend getting him into a puppy class. That way he can safely socialize with people and other dogs so that he can start building positive associations!
Murdock, BH - GSD
Virgil, CGC - GSD
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Tara, Reagan, Madison, and Jefferson - Aussies