Bella is 10 months old, and all of a sudden she's barking like crazy. It's usually at my dad when he walks through the door. Whether he just got home from work, or he went in the backyard for 2 minutes and came back. I live with my parents so she's known my dad since day one. She just keeps going and going. What is the best way to get her to stop and break her from this habit she's fallen into?