How do dogs think?
Dogs originated from the wolf and while domesticated they still live close to their origins. Essentially they are a pack animal and in the wild they have a well established pecking order from the top dog to the lowest. Domesticated dogs see their human family as their pack. Ideally you have established yourself as the pack leader and provide them with calm effective leadership. Your home, property and possessions will form their territory and they will instinctively guard and protect them.