Across North America there is a need for dogs to handle different types of cattle in many conditions, climates and terrains.  From the cattlemen in the south, southeast, mid-west, west, pacific northwest and Canada, various lines of Working Cow Dogs have emerged.  These dogs come from a variety of working stock dog breeds, such as Border Collies, Heelers, McNabs, Kelpies, Catahoulas, Black Mouth Curs and more.