Dog Problem. Neighbor Problem. Help?

My dog is a very hyper playful little thing. Actually, he's not so little as he's a full grown Australian Shepherd (mix). I've socialized him with other dog very often, every since I got him from the shelter when he was about 4 months old. I've really only socialized him off leash at dog parks where he can roam and play freely. I've never really had a problem until I walk him around my neighborhood. When he was over a year old he became leash aggressive whenever he sees other animals. He only

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