Dr. Jean Dodds recommends to NOT use a raised bowl. She also lists several other ways to help prevent bloat if the dog or the breed is known to be prone. And some of the recommendations are for any dog.
Dr. Jean Dodds' Pet Health Resource Blog | Gastric Dilatation-Volvulus (Bloat) in Dogs
However, I know for sure I found another writing from Dr. Dodds where she says the reason not to use raised bowls is because they may promote gulping and air is swallowed along with food. And in the other writing she also says the verdict is out on whether raised bowls are good, bad or or no consequence.
Sorry, I just searched again and cannot quickly find the other writing.