Answered on Quora.
That’s not possible at all. One diagnosis would cancel out the other one. It’s not possible to have both diagnosis.
A Dependent PD is characterized by an excessive need for others and an intolerance of being alone.
A Schizoid PD is characterized by no need for others at all and a love and preference for being alone.
You can’t both need people and not need people. You can’t both love and prefer being alone and be unable to tolerate being alone.
The diagnoses cancel each other out.