This article is from the Rottweilers Breed FAQ, by firstname.lastname@example.org (Denise Gross).
VWD is a hereditary a bleeding disorder similar to hemophilia. Dogs
affected with VWD may have symptoms ranging from prolonged bleeding of
toenails cut short to hemorrhaging during minor surgical procedures.
Dogs may be carriers while exhibiting no outward symptoms. VWD is
diagnosed through blood screening.