1 year old barking at other dogs when out and about.

[Emoore]

You see this a lot in dogs that are heavily socialized with other dogs in offleash dog park type settings. The dog learns that other dogs are there to be played with and that the human is a nuisance getting in the way of their playing. He's learned to focus on other dogs and the fun that comes from them, rather than focusing on obeying you.

I'd definitely get involved in group classes where he can learn to focus on YOU in a room full of other dogs that are also on leash, learning to focus on their owners.