Recent studies have found Raised bowls to be a No No for dogs pedisposed to Bloat: what can we do to prevent bloat?  Dr. Biggerstaff recommended that:

if a dog is predisposed and you are having it spayed or neutered, have the stomach tacked to the rib cage wall at the same time. add water to the food feed more than one type of food (e.g. dry plus canned) slow down a fast-eating dog (one method she suggested to do this is to put a large rock or can in the food dish) reduce stressful situations don't feed free choice feed two meals equally spaced maintain a routine feeding schedule limit exercise for at least 30 minutes to one hour after a meal let dogs cool down after exercise before they are fed do not feed from a raised food bowl