Thunder shirts are useless IMO. I think a harness would be better. Plus, and PLEASE SOMEONE CORRECT ME IF I AM WRONG, a harness would be a good idea if you get your dog to utilize it in an associated behavior sort of way. For example, iF I put the harness or prong on my GSD, he knows it is "working time." He hyper focuses when the harness or prong is on because he associates them with obedience and tracking work only.
So if you find something that you use with your dog that you can use to help correct the behavior stick with it. If your dog associates the thing with not lunging and overall good behavior, he may only behave the way you want him to when he has that thing.
Does this make sense? I don't know the technical lingo.
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Kaleef Black Bear Bugatti
CGC, Advanced Obedience, Intermediate Air Scent Tracking,
600+ trail miles
Jackson von der Rescue Farm (schnoodle)
75+ trail miles