I understand your frustration! I feel that there are some dogs that are just, high strung? nervy? I don't know exactly the word, but they are easily stressed and act out, no matter what training and socializing you have done, and I know you have tried everything with Truman. I think they are sort of like spooks, in that the behavior is just part of them. You can learn to manage it, and sometimes make it better, but it isn't something that can be trained out of them. My heart dog, Fletcher, was very like Truman, and there are many things I just stopped doing with him. It wasn't always easy, but I loved him so much and miss him every day, although there is no question my "dog life" is easier now.