My 11 year old daughter has been coughing a lot lately..a dry cough. I think she had a very minor cold about a week ago which started the cough. Right now, no real cold symptoms. But, a long time ago, she was tested positive for severe dust allergy. But, she normally does not have any allergy symptoms, no wheezing, sneezing, breathing issues at all. The allergy doc said that allergy shots would be a good option. Can dust allergy cause dry cough? Also, is it possible to really dust proof her room when there is carpet in it? Cannot remove carpet since we live in an apartment..