I believe that DHS is a Doctor of Health Sciences degree, & ScD is for a Doctor of Science. I don't know anything about the breadth & depths of these studies, but according to a quick search I just did on the University of Indianapolis & Johns Hopkins pages, respectively:
DHS; Students interested in the postprofessional DPT must have a U. S. license to practice physical therapy. This degree is designed to expand the knowledge and skills of physical therapists in the areas of evidence based clinical practice and medical sciences.
ScD; The Doctor of Science (ScD) degree is available in some departments as an alternative to the PhD degree. Admission and graduation requirements are similar. The Doctor of Science (ScD) degree is for individuals of exceptional ability who seek to establish the methods and skills needed for a career in research, often in an academic setting.
hope that helps 🙂
