Dogs bark for different reasons.Like if they are tied to a tree with a leash, they will likely bark to get off the leash and go to someone or somewhere.Another reason why dogs bark is if they see somebody they want to know who they are, they will bark or try to smell and see their face to see if they refer to them.httpwww.youtube.com/watch?v=zhM1xb6VbHg://-.Dogs also bark to discipline their young, to play, and threaten intruders.So dogs bark for a lot of different reasons.