Can A Wheat Allergy In A Dog Cause Diarrhea?

Can A Wheat Allergy In A Dog Cause Diarrhea? Some dogs when reacting to a wheat or grain allergy might have gastrointestinal problems such as diarrhea or chronic gas. Although, diarrhea and gas are symptoms of many problems, if accompanied by any of the other symptoms it is likely that the allergy is the cause.