There are some important diseases that are common in Dobermans that potential Doberman owners should be aware of. Experienced Doberman owners call them the "3 C's" . . . Cardiomyopathy, Cancer, and CVI (Cervical Vertebral Instability, or Wobbler's). All of these conditions are heart breaking for breeders and owners alike. Here are some links to current information about the diseases, along with current research and treatment modalities.
Cardiomyopathy
https://dpca.org/PublicEd/the-doberman/health/genetic-diseases/dilated-cardiomyopathy/
http://www.ncstatevets.org/genetics/dobermanpinscherdcm/
http://www.mydogdna.com/blog/dilated-cardiomyopathy-what-test-telling-and-should-i-be-worried
https://peerj.com/articles/842.pdf
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0020042
Cancer
https://dpca.org/PublicEd/the-doberman/health/genetic-diseases/cancer/
CVI - Cervical Vertebral Instability