I have a seven month old female puppy. She has been very quiet and welcoming of guests coming into our house. I had not had a problem with her barking as she was quiet. However, up until a few days ago, she started barking at them nonstop. She will bark when she hears them, when they walk into my room, when she's near them, and so on. I don't understand how this happened, and how can I train her to stop this behavior?
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