When your dog struggles with allergies, you feel terrible. The average commercial dog food has SO MANY things on the label! How are you supposed to figure out which is the culprit? That's where the idea of limited ingredient dog foods came about. By cutting out some of the extras, they're supposed to help sort out canine allergies. Unhappily, they can CAUSE problems, too. It's important to understand everything about these diets before you bring one home.