Dogs bark for a variety of reasons.

• Excitement. Young dogs primarily bark out of excitement. Practicing obedience in public daily will calm her. When she barks, draw her attention to you with a food treat. She will soon look at you and ignore distractions in anticipation of the treat.
• Fear. If your dogs body posture is low to the ground, she may be barking out of fear. Do not punish her for this or she may become more fearful and might bite. In addition to professional training- build her confidence & re-direct her attention towards you using the techniques outlined in #1.
• Dominance. If her body posture is forward and upright she may be engaging in dominant or territorial barking. Dominant dogs can become aggressive if they are physically corrected for barking. In addition to professional training, re-direct her attention to you using techniques in #1.
• Demand. Some dogs bark at their owners to demand attention or other favors. Each time your dog barks at you, get up and walk away. If she never gets any attention or favors from you for barking, she will stop. Teach your dog that obeying obedience commands is the best way to get your attention.
• Boredom. Increase her daily exercise and add new, interesting toys to the yard. If these techniques do not resolve the barking, she may be trying to tell you she is ill. Have her examined by your veterinarian.