My suggestion may not be terribly popular with some people, but...my GSD, Hans, was about the same age as your dog when I first adopted him and took him to training. Did not have an aggressive bone in his body. Happy to see people, but so super happy to see another dog on a leash going down the sidewalk that his behavior was nothing short of embarrassing! His reaction to other dogs turned out to be the worst problem he initially had. After trying to redirect his behavior (can you say IMPOSSIBLE?) and trying to correct with a prong collar, the trainer, who had an e collar but literally had not had to use it on a dog in many years, finally suggested it might be the best bet. It turns out it only took two sessions with it and it was only used on Hans once each session. Hans finally got the "big" picture and no longer behaves like an idiot around other dogs.
The final straw that led to the use of the e-collar was when I was walking down the sidewalk during training and Hans saw a puppy being walked across the street. The pup completely ignored Hans, but Hans just went crazy- I thought I was going to be pulled into the street. The trainer told me to heel him and keep walking. There was NO way!
The trainer then took him over to a vacant lot and put him through many, many commands to try to get him under control. The trainer is a big guy at 6'5" and 250 lbs. He could barely control him. We both realized then that a little something extra was needed.
I do want to stress that the trainer did not believe Hans wanted to hurt the other dogs- he simply gets too amped up when can't get to them to meet them.
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