When working with a patient diagnosed with dependent personality disorder, the therapist must be particularly careful that the patient does not?

Well I'm just shooting in the dark for the obvious, but they must be careful that the patient doesn't depend on them too much. Although you're a therapist to help them, you need to walk a fine line so they don't always come to you for help and are able to do their own decisions. I'm sure it wouldn't be a bother to help them every now and then to help them make their own decisions, but there'll be times a therapist can't help (or opinionate) or simply believes that the person can work it through.

Bulling? or do you mean bullying?