Sadly, there is little evidence to back up that claim. In fact, when reviewing confirmed food allergies
among dogs, corn and rice have the same number of cases (about 2.4% of all allergies). Beef, wheat, and dairy continue to be the leading reasons for food allergies. Could corn eventually rise up higher? Certainly…given it’s prevalence in many diets, it has that potential, but until your pet is proven allergic to corn through elimination diets, I wouldn’t worry about it.