It doesn't matter if you are walking a 200 pound Mastiff or a 3 pound Chihuahua, the dog should walk beside or behind you (the owner). When the dog is aloud to walk in front of the owner or walk through open doors ahead of the owner the dog becomes the alpha. The human should always be the alpha or the top dog in the relationship. As Cesar Millan would say "be the pack leader, always practice exercise, discipline, then affection".
