
“Teaching a dog to be alert to the scent of gluten is much more complicated than most scent-detection training, because gluten comes in so many forms. A type of protein commonly found in wheat, rye and barley, gluten is widely used in products other than the obvious — cereals, breads and pizza — after being processed in various ways. Gluten, in fact, can be used as a filler, binder or thickener, hidden in all manner of food, including, for example, soy sauce, many salad dressings and even some toothpaste.”
Source:
USA Today