Blue Heeler/German Shepherd Mix started nipping

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Barked: Sun Feb 14, '10 10:42pm PST 
Carver is 14 months and very recently has begun to display signs of leash aggression, aggression with other dogs, and at a restaurant last night, he even growled and nipped at the waiter. This is completely uncharacteristic of him up to this point... he has always been extremely friendly and playful with anyone and everyone. It has been said that this is an age that his traits will start to really show.

I've always been very careful socializing him and putting in different situations. What do I do next? I just recently started using a pronged collar for walks, could that be part of the problem?

Thanks smile