This document provides information on hog zoological classification and various pig breeds. It begins with the taxonomy of pigs, listing their kingdom, phylum, class, order, family, genus and species. Several main pig breeds are then described in detail, including their origins, characteristics and advantages/disadvantages. These include Landrace, Yorkshire, Duroc, Pietrain, Hampshire, Berkshire, and Poland China. Other breeds such as Spotted and Chinese native pigs are also overviewed. The document concludes with sections on Philippine native pigs and methods for upgrading native stock.