Many people are allergic to animals. Most people are not allergic to the animal's fur or feathers. The allergy is more usually an immune reaction to a protein (an allergen) found in the saliva, dander (dead skin flakes) or the urine of an animal. The allergen gets carried in the air or in dust on very small, invisible particles. It then lands on the lining of the eyes (conjunctiva) and nose. It may also be inhaled directly into the lungs, causing allergic symptoms. Allergen contact with an allergic person's skin may also cause itching and hives .

Cat Allergy

One of the most common pet allergies. A tiny protein particle, the Fel d 1 allergen , found in the cat's skin flakes and saliva causes this allergy.