This actually sounds a lot like my pup, also 5 months old, minus the bolting because I don't trust him off leash outside the house.
But yeah the barking and hackles at other dogs on walks, and the barking at everything when we're in the yard (he's on a 30 foot tie up because our yard isn't fenced). And very friendly once he actually meets these dogs. And amazing around people, we spent our last walk meeting kids as they were getting out of school.
I've been working on continuing the socialization and have been seeing successes. Just try and keep his focus on you, figure out what his thresholds are and work within them to the best of your abilities, and praise/treat heavily when he does well.
When we have a situation where we turn a corner on the walking path and come across a dog, I will often make Thor sit and let the other dog pass, try and keep his focus on me by being as exciting as possible, and then praise/treat heavily if he remains calm.
We do always have a tough time when we walk by the fence of one home though, where they have two pugs that go insane whenever we try to walk by, causing him to go insane as well. I often times have to cross the street just to make that part of the walk less stressful.
We're still actively working on it, but he is getting better and better everyday!
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