This just started a couple weeks ago? How old is she? I think Joey was at least 5 months when he started to bark, and he did love his voice. It took some real training to do away with the excessive barking. Their hearing is better than yours, so they can hear things you can't. Dogs were originally kept around for the purpose of alerting people to the presence of a stranger, and this trait has been breed into them. Now whether or not Abby can see ghosts, I'd rather not know.