As you may have realized, Dachshunds are always on alert when someone new arrives on the scene. They usually perceive people they do not know immediately, however, sometimes they start to growl or bark at some, but not at others. This momentary bad temper could indicate aggression, a defensive attitude or simply some kind of anxiety. But, why do they have different reactions depending on the individual? Could they know something about them that you do not know? Few people can summarize the reactions of all dogs, and definitely, each case is unique, although we can see the way dogs perceive their world and, perhaps, get an idea about this interesting question.