Sorry to hear its not going so good for you. Since he's still young I would like to think you have a chance to correct bad behavior. My 2 older dogs aren't perfect. I actually have started working each of my dogs separately. Kiya has some leash reactivity with other dogs that I am working on. It is one of the reasons I have issues with leash corrections. I found information about B.A.T. behavioral adjustment training that I have been working on with her. I would think it all depends on how much time you have to put into this guy, and of course it wont happen over night and you may never truly be able to trust him.