Most often, when a veterinarian, kennel or pet shop owner begins looking for an air cleaner, it's because of odor, allergies from the dander, or just a desire to make sure the air remains clean for customers and employees. Unfortunately, most people go looking for an air purifier that says 'pet air cleaner' or 'for pets'. And while there are a couple of units that do a decent job of removing dander, hair, and odors, they're usually inadequate for handling the amount of dander and odors produced by multiple pets in one indoor area--or it would take an army of these air cleaners, which can get expensive and take up too much floor space.