Some pet owners avoid wheat because they worry about their pet being allergic to wheat or wheat gluten. The reality is that only 10% of allergic skin conditions are caused by foods. Most allergic conditions are caused by environmental triggers like dust, pollen, or molds. Parasites such as fleas, are also likely triggers for allergies.
If a food allergy does exist, any ingredient can cause it, although proteins are the most likely culprits. If a food allergy is suspected, it is important to have a veterinarian diagnose the allergy based on an elimination food trial. Food allergies are just one cause of skin and GI problems. Wheat is an excellent source of complex carbohydrates needed for energy.
So remember: allergies to wheat are not common, and the only way to diagnose a food allergy is with an elimination diet trail, prescribed by your veterinarian.