I have a 4 year old german shepard, that is exsibiting some odd behavior as of late. She has been unusualy agressive with myself and my children. She has started to bark, and snap at us as if we were strangers, until I frimly call her name, and she seams to "snap out of it". Could this be a sign of her behavior changing, or a sign of her turning on us? We treat her as part of the family, never mean or agessive toward her. We have owned her since her brith, and these recent events have made us question the safety of leaving our children unattended with her. Any insight into this is greatly neaded. Thank you