I am now having a problem with my 4 yr. old male GSD. I rescued a female GSD that is 18 mos. old, 3 months ago. They seem to get alone pretty well. However, he has become pretty aggressive. He also suffers from severe separation anxiety. His behavior has regressed back to the beginning. It came to a head several weeks ago when I went out into my front yard to water flowers. I heard the front door slam, saw a flash and then heard screaming,-my male had unlocked the front door and storm door, and he attacked a small dog that was walking with its owner on the street in front of the house. He would not come, off, or down, when I commanded him to. He has been obedience trained to work well for me off lead. He refused to listen or obey, and attacked the little dog even after the owner had picked it up. He did not hurt the owner. The behaviorist said he probably did not hurt the dog much, he was just being territorial. Had never seen dog or owner before and when I searched for them, couldn't find them. Called emergency vets and dog had not been brought in. It took awhile to lure him to where I could catch him. I am now very nervous. I am not certain exactly what to expect. My neighbors called the police and dog warden. They are afraid that he will come over my 4 foot chain link fence and attack them or their dog. Am having a six foot solid wood fence installed, he is now on anxiety medication, and we started to see a behaviorist, Ken McCort in Ohio. He will be tied, and barking crazily to get my attention. He is ignored until barking stops for a second. He is also having many accidents in the house while I am at work. Have had to confine him in his big crate, 10x6x6, which he hates. He barks all day. I am afraid to take him anywhere. Behaviorist thinks we can level his learned behavior of barking, down to nothing, as long as I pay no attention to him when he does bark. Any other suggestions?