Question: Which of these breeds is now extinct and was never established, the Toy Bulldog or Wirehaired Vizsla?
Context: The Leavitt Bulldog is a late 20th-century re-creation of the now extinct Old English Bulldog, the original bulldog breed which existed around the 19th century Regency era, about 1820.  In contrast to English bulldogs of modern times, depictions of the breed from nearly two centuries earlier showed healthier, more agile dogs, with working ability.  Unlike the 19th century breed however, the Leavitt Bulldog has a placid temperament.  It is one of several breeds developed in order to overcome the genetic problems in the English Bulldog breed.  The Leavitt Bulldog was developed by breeder David Leavitt which he originally named the Olde English Bulldogge.  Leavitt has since disassociated himself with this name for the breed and set up the Leavitt Bulldog as its name due to many later OEB litters losing many of the qualities of his original OEB litter.  David Leavitt's "Leavitt Bulldogs" were purebred from the earlier Olde English Bulldogge stock.  Regardless of this, the original name has been adopted by the United Kennel Club whose breed standard is adopted as of 1 January 2014.  The Leavitt Bulldog was mentioned in the documentary "Pedigree Dogs Exposed – Three Years On" as a suggested healthier alternative to the English Bulldog. The Český Fousek is a Czech breed of versatile gun dog.  They are wirehaired, and have the beard and moustache ("facial furnishings") common to the wirehaired breeds.  There is a dramatic difference in size between the bitches and dogs of this breed. Toy Group is the name of a breed group of the smallest kinds of dogs, used by kennel clubs to classify a defined collection of dog breeds. "Toy Group" does not necessarily refer to one particular type of dog.  Most major English-language kennel clubs include a "Toy Group" although different kennel clubs may not include the same breeds in their "Toy Group".  The international kennel club association, the Fédération Cynologique Internationale, includes toy dogs in Group 9 "Companion and Toy Dogs", which is then further broken down into eleven "Sections" based on dog type and breed history. The Toy Bulldog is an extinct dog breed that existed in England at 18th and early 19th centuries.  Breeders were working in two different directions to create this breed.  One was to downsize the Bulldog.  This was not very successful due to complications with breeding sub-regular size dogs of this breed together.  The dwarf size Bulldog puppies were and still are occasionally born out of regular size parents, but they were neither the healthiest, nor the most fertile dogs.  They often produced regular-size puppies.  Thus, this version of the breed had never been established. Cryoconservation of animal genetic resources is a strategy wherein samples of animal genetic materials are preserved cryogenically.  Animal genetic resources, as defined by the Food and Agriculture Organization of the United Nations, are "those animal species that are used, or may be used, for the production of food and agriculture, and the populations within each of them.  These populations within each species can be classified as wild and feral populations, landraces and primary populations, standardised breeds, selected lines, varieties, strains and any conserved genetic material; all of which are currently categorized as Breeds."  Genetic materials that are typically cryogenically preserved include sperm, oocytes, embryos and somatic cells.  Cryogenic facilities are called gene banks and can vary greatly in size usually according to the economic resources available.  They must be able to facilitate germplasm collection, processing, freezing, and long term storage, all in a hygienic and organized manner.  Gene banks must maintain a precise database and make information and genetic resources accessible to properly facilitate cryoconservation.  Cryoconservation is an "ex situ" conservation strategy that often coexists alongside "in situ" conservation to protect and preserve livestock genetics.  Cryoconservation of livestock genetic resources is primarily done in order to preserve the genetics of populations of interest, such as indigenous breeds, also known as local or minor breeds.  Material may be stored because individuals shared specific genes and phenotypes that may be of value or have potential value for researchers or breeders.  Therefore, one of the main goals remains preserving the gene pool of local breeds that may be threatened.  Indigenous livestock genetics are commonly threatened by factors such as globalization, modernization, changes in production systems, inappropriate introduction of major breeds, genetic drift, inbreeding, crossbreeding, climate change, natural disasters, disease, cultural changes, and urbanization.  Indigenous livestock are critical to sustainable agricultural development and food security, due to their: adaptation to environment and endemic diseases, indispensable part in local production systems, social and cultural significance, and importance to local rural economies.  The genetic resources of minor breeds have value to the local farmers, consumers of the products, private companies and investors interested in crossbreeding, breed associations, governments, those conducting research and development, and non-governmental organizations.  Therefore, efforts have been made by national governments and non-governmental organizations, such as the Livestock Conservancy, to encourage conservation of livestock genetics through cryoconservation, as well as through other "ex situ" and "in situ" strategies.  Cryogenic specimens of livestock genetic resources can be preserved and used for extended periods of time.  This advantage makes cryoconservation beneficial particularly for threatened breeds who have low breed populations.  Cryogenically preserved specimens can be used to revive breeds that are endangered or extinct, for breed improvement, crossbreeding, research and development.  However, cryoconservation can be an expensive strategy and requires long term hygienic and economic commitment for germplasms to remain viable.  Cryoconservation can also face unique challenges based on the species, as some species have a reduced survival rate of frozen germplasm. The Bullenbeisser (also known as the German Bulldog) was a breed of dog known for its strength and agility.  The breed was closely related to the Bärenbeisser (some believe that the two breeds were the same; the names mean "bull-biter" and "bear-biter," respectively), and the Boxer.  It was, in all its aspects, similar to the present Alano Español (Spanish Bulldog) and very alike to the Dogo Argentino, not only in aspect, but also in usage.  There were two regional varieties, the Brabanter Bullenbeisser and the Danziger Bullenbeisser.  The breed is now extinct. The Bulldog is a medium-sized breed of dog commonly referred to as the English Bulldog or British Bulldog.  Other scent-hound breeds include the Small Greek Domestic Dog, Irish Wolfhound, Bluetick Coonhound, Finnish Lapphund, and the Basset Hound.  The Bulldog is a muscular, hefty dog with a wrinkled face and a distinctive pushed-in nose.  The American Kennel Club (AKC), The Kennel Club (UK), and the United Kennel Club (UKC) oversee breeding records.  Bulldogs were the fourth most popular purebreed in the US in 2007 according to the American Kennel Club. The Vizsla is a dog breed originating in Hungary, which belongs under the FCI group 7 (Pointer group).  The Hungarian or Magyar Vizsla are sporting dogs and loyal companions, in addition to being the smallest of the all-round pointer-retriever breeds.  The Vizsla's medium size is one of the breed's most appealing characteristics as a hunter of fowl and upland game, and through the centuries the Vizsla has held a rare position among sporting dogs – that of household companion and family dog. The Boxer is a medium-sized, short-haired breed of dog, developed in Germany.  The coat is smooth and tight-fitting; colours are fawn or brindled, with or without white markings, and white.  Boxers are brachycephalic (they have broad, short skulls), have a square muzzle, mandibular prognathism (an underbite), very strong jaws, and a powerful bite ideal for hanging on to large prey.  The Boxer was bred from the Old English Bulldog and the now extinct Bullenbeisser which became extinct by crossbreeding rather than by a decadence of the breed.  The purpose of the crossbreeding was the wish to eliminate the excessive white color of the breed, and the necessity of producing thousands of dogs for one of the most popular breeds in the world.  The Boxer is part of the Molosser group.  This group is a category of solidly built, large dog breeds that all descend from the same common ancestor, the large shepherd dog known as a Molossus.  The Boxer is a member of the Working Group. The Wirehaired Vizsla ( ; ] ; English plural: Vizslas or sometimes Vizslak, based on the Hungarian plural vizslák ] ), is a dog breed originating in Hungary.  Wirehaired Vizslas are known as excellent hunting dogs, and also have a level personality making them suited for families.  The Wirehaired Vizsla is a versatile, natural hunter endowed with an excellent nose and an above average trainability.  Although they are lively, gentle mannered, demonstrably affectionate and sensitive, they are also fearless and possessed of a well-developed protective instinct.  The breed has a firmness on point, is an excellent retriever, and has the determination to remain on the scent even when swimming.  The overall appearance embodies the qualities of a multi-purpose pointing dog, endurance, working ability and an easily satisfied nature.  This is a dog of power and drive in the field, yet is a tractable and affectionate companion in the home.
Answer: Wirehaired Vizsla