We have a sweet 19 month old girl. We have had her since 7 weeks old. So far, she has done fairly well with training / obedience. She has mellowed out in the past 2-3 months. BUT, here recently, if I give ANY attention to any person or God forbid even my phone, she nips at me and barks at me. This is especially true if my daughters dog (with whom she plays with quite nicely) seeks my attention by wanting to sit next to me. My dog goes crazy. She has never been this way. Why is she doing this all of a sudden? *she doesn’t growl, bite, or become aggressive with others, but I take this matter serious as she nips my hands pulling on me and yes… it hurts!