2yr old Labrador mix suddenly aggressive toward other dogs?

Asked: 2yr old Labrador mix suddenly aggressive toward other dogs?Hi,I have a sweet and playful Lab/Shepherd/Rottie mix dog who'll be 2 in March. I've had him since he was a puppy and has never shown aggression toward other dogs. Recently, well, for the past month or so, he's become aggressive toward other dogs. Each time we're out for a walk, he'll try to fight with any other dog that's out for a walk. I'm frustrated and not sure how I can rid him of this

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