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©2013 UpToDate ® Print Email Avoidance measures for animal dander Removing animals from the house Keep animals outside, eg, in garage or kennel; restricting animals to certain rooms has not been shown to be effective. Once animal has been removed, the premises should be cleaned thoroughly. Controlling allergen with an animal in the house Difficult because the animal contains 10-50 mg of major allergen, while the quantities of airborne allergen are only 5-20 ng/m3. Using an air filter can only reduce airborne allergen. Reduce reservoirs: remove carpets, reduce upholstered furniture to a minimum, replace drapes with blinds, or/and vacuum clean weekly using a vacuum with good filtration, ie, double thickness bags and/or HEPA filtration. Room air filters: HEPA or electrostatic (maintenance data are better defined for HEPA). Washing cats does not reduce allergen levels significantly. Washing dogs twice a week may help.