I am so glad he's doing better! And, I don't like those pronged collars either. I think they're cruel. I don't have any advice for you. Kay might as Simba was quite aggressive when she got him and still is sometimes. One time, I was holding him at the dog beach and a guy approached him. He lunged at the guy. But the dummy was asking if he would bite as he was doing it. Not too much common sense. I just wasn't expecting it, is all.