Boomer is getting better

Boomer does great in a place without distractions. I was able to work with Boomer for about an hour and a half again today with a good chunk of that time doing some work at the park. On the way to the park Boomer was the most aggressive. At the park and after the park Boomer become much more calm and submissive but not completely.
An empty park is a nice place to work on a particular problem without distractions like cars, people, and other dogs. I used a long line of about 20 feet. We ran and did some basic obedience work.
The run is what set up the bond that made it possible to do obedience work. Even though I gave him the full 20 feet of line I made it clear that I was his leader. I didn't hit him or punish him. I led and corrected him. I started by giving him about 5 feet of line and had him run next to me. Almost immediately he moved behind me and I rewarded his submissive behavior by giving him more line and inviting him to come next to me and even in front of me. After running for about 20 minutes I had him stop and sit. I had him sit until I had stretched the rope out and then would call and have him come to me. Every time I bent down to reward him with petting. After the basic obedience work we ran a short time again and then we went back to the humane society.
The walk back to the humane society started a little rough as Boomer wanted to take control once we moved to a new setting. By being a calm-assertive leader I was able to get him to calm down and he was totally ignoring both cars and people but still had a little trouble with other dogs by the time we got back.
If we are able to get Boomer out for workouts like this he will be well on his way to becoming more adoptable. We will still need to work on introducing him to other dogs and how he interacts with them but I think it is a very good possibility that this can happen.