Borderline Collie
"Borderline Collie, why must you shout? One day you love me, the next you freak out."
Borderline personality disorder (BPD) is a serious mental disorder marked by a pattern of ongoing instability in moods, behavior, self-image, and functioning. These experiences often result in impulsive actions and unstable relationships. A person with BPD may experience intense episodes of anger, depression, and anxiety that may last from only a few hours to days.
- NATIONAL INSTITUTE OF MENTAL HEALTH