A kennel club (known as a kennel council or canine council in some countries) is an organization for canine affairs that concerns itself with the breeding, showing and promotion of more than one breed of dog. Kennel Clubs became popular in the mid 19th century and were founded on the principles of eugenics. All-encompassing kennel clubs are also referred to as 'all-breed clubs', although "all" means only those breeds that they have decided to recognize, and "breed" means purebred dogs, not including dog hybrids and crossbreeds or mixed-breed dogs. A club that handles only one breed is known as a breed club.