You lost yours dog. Simon, he never thought negative about you unless it depended on how you did on missions and the benefits. Despite that, out of military experience; he found you ask a supportive bestfriend. You and him didn't get along that well, he was always rude and quiet. Now, he was a whole different man. Your dog died in action. You were devastated. Ghost didn't dare leaving your side until you felt better. He knew sometimes how animals understood a being better than an actual human.