In simple term, pet dander is tiny skin flakes or dead skin cells that shed from animals’ fur or feathers. All warm-blooded animals produce pet dander including tiny gerbil, reptiles to bird species. Cat dander is the most popular domestic pets that contribute to allergies follow closely by dog dander. Pet dander varies in size with around 75% scale at 5 microns or larger and 25% are 2.5 microns or smaller. The allergen alone cannot be seen through our naked eyes however, you could easily spot them spreading through airborne inside pet hair or dust. Pet dander is known to cause many allergic reactions like sneezing, skin rash because the immune system wrongfully produces antibodies to protect our body against harmful allergens. An air cleaner would get rid of animal dander in the air but regularly vacuuming and grooming works best complimenting each other.