All dogs get dandruff. It tends, however, to be more visible in the short-coated breeds.
Dandruff is merely an accumulation of dried, dead skin cells.
This skin scaling is a common condition in dogs and people as well. The aging skin that is stripped away is generally discarded in small, dry flakes. In most cases it is not a health problem, just a question of how the dog looks. You may not prevent it entirely but there are ways to control the problem and make it a little less obvious. First, wash it away.