Adding my two cents:
Star (Dane) was a rescue from MAGDRL, and so we are required to feed her on an elevated surface. We also elevated one of the water bowls (we have two cats, so we have one bowl on the floor in the bathroom for them). Star refuses to drink out of the water bowl on the floor! Max (chow akita mix) will drink out of the "floor bowl" if necessary, but Star would rather dehydrate than lower her head to drink!
Of course, if you drop a miniscule piece of food on the floor, she'll gobble that up right off the floor. But if you're giving her something in a bowl, it had better be raised or she will turn up her nose!
Tracy