protecting

A few days ago I sent in a question saying that our jrt would bark at any company that came over and would stay away from them. I made a mistake and said that he was 3 and half years old when he is only 3 and half months old. We are planning on taking him to training once he gets his puppy shots. He also has a habit of wanting to eat everything in sight even if he has already been fed. I was just wondering if this was normal for his age?