Allergies to Animals Make an Appointment Patient Education Find a Doctor Download Patient Education Animal dander (dead skin that is continually shed), urine and saliva can cause an allergic reaction. Exposure to these allergens, especially breathing in particles which include dander, cause the allergic reaction to animals. Download PDF: Allergies to Animals Download PDF: Allergies to Animals View more information on Animal Allergy National Jewish Health authors free downloadable patient education materials to provide you and your family the information and tools to help manage your disease. They include Understanding Booklets, Med Facts, Test Facts, Medication handouts and more. Search Free Education Materials