“What can I do if my dog is allergic to dust?”

Unfortunately, there isn't much you can do besides dust/clean your home regularly (every other day or every 2-3 days) and give them anti-allergy medication if their symptoms continue (e.g. red eyes, coughing, sneezing, etc). You can give them 1 mg of benadryl per lb they weigh, given once or twice a day depending on severity (i.e. if your dog weighs 10 lbs, giving them 10 mg of benadryl in the morning and, if severe, another 10 mg at night but no more).