1. During warm weather, open windows to allow an exchange of air through the house, so that airborne dander allergen can escape. (This will be counterproductive, however, if the patient is also pollen-allergenic, as it will allow outdoor pollens to come in.)

2. With windows closed, HEPA (High Efficiency Particle Arresting) or ULPA (Ultra Low Penetrating Air) air cleaners can remove significant amounts of animal allergen. Air cleaners are more effective at removing animal allergen than they are at removing dust mite allergen. This is because the much smaller and lighter dander allergens are always in the air, and thus subject to the filtering effect of the air cleaner.