In animal allergies, your body reacts to the scales shed from the animal's skin - also known as "dander". These scales, or allergens, enter the body through the respiratory system. The first manifestations of animal allergy could be as hay fever and/or asthma.
Where are animal allergens found?
The simple answer is: Everywhere! Animal dander, the real cause of animal allergy, may still be present in your home five years and more after an animal has lived in it. Animal dander is present all year round in even the cleanest homes and institutions
It even finds its way to places animals have never been, carried by the air or on people's clothing. In this way it affects many animal-allergic children at their day-care institution or school.