Dogs don't pop up one day and just say, "I think I am going to bark my head off at people today." No. Their brains aren't capable of that. They do it for a reason. They might not be trained or have been socialized enough, or they think that they control their owners. It isn't always the owner's fault, either; they might have been taken from their litter too early or too late, or if they came from a shelter, they might have come from a bad home where they were abused. Some dogs are also naturally dominant. But there is always a reason that a dog misbehaves. I guess I should have clarified before everyone jumped on me. I hate it when dogs bark in your face all day long. I know they're hard to control at times, but so are many other pet peeves people havee. I get to put up with it from other people's dogs every day of my life, and that's why it ticks me off so much.