Wheat allergies are caused when the dog's immune system overreacts to the proteins in the gluten found in certain types of wheat. These proteins cause inflammation in the mouth, nose, eyes, and throat. The condition can be dangerous for dogs' bodies, especially to infants and puppies, affecting their growth and overall health. A wheat sensitivity does not involve these proteins, but rather the gluten in wheat products triggers inflammation in the body. It might cause stomach problems, such as indigestion, abdominal pain, or headaches.