Dog Aggression?

[ragnarok20]

So I adopted this dog a little over a year ago when he was 2.5 yeas old. I knew that when I adopted him that he was poorly socialized around other dogs because his previous owners had a dog that was aggressive towards other dogs. My issue is this: whenever we are on our walks he goes completely apeshit around other dogs depending upon proximity

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[ragnarok20]

here's a picture of him