Question: Which dog breed was bred as working farm dogs, Galgo Español or Boerboel?

Context paragraphs:
Boerboel: The Boerboel ] , also known as the South African Mastiff, is a large, Molosser-type breed from South Africa bred for the purpose of guarding the homestead.  These dogs were bred as working farm dogs and is one of the most powerful dog breeds.

Austrian Pinscher: The Austrian Pinscher (Österreichischer Pinscher, FCI No. 64) is a medium-sized breed of pinscher-type dog from Austria, where dogs of the type were originally farm dogs, keeping barns free of rats and acting as home guards, livestock guardians, and drovers.  The name originally given to the breed in 1928 was the "Österreichischer Kurzhaarpinscher" ("Austrian Shorthaired Pinscher") to differentiate it from similarly named breeds, but today in its country of origin the breed is officially called the Österreichischer Pinscher, or Austrian Pinscher in English.

HMS Galgo: Five ships of the Royal Navy have borne the name HMS "Galgo", after the Galgo Español, the Spanish greyhound:

Koolie: The Koolie (also known as the Australian Koolie or by the misnomer German Coolie) is an Australian dog breed.  The Koolie is a working or herding dog which has existed in Australia since the early 19th century when it was bred from imported British working dogs.  Robert Kaleski, in an article on Cattle Dogs in the August 1903 issue of the Agricultural Gazette of New South Wales, describes the "Welsh heeler or merle, erroneously known as the German collie," as a "blue-gray dog about the size and build of a smooth-haired collie, generally with wall eyes."  The British background predominated in the dogs that came to be associated with the "German collie" name.

Boerboel International: Boerboel International (BI) is an international representative association of breeders, members, and Boerboel owners.  The Boerboel is a large, molosser species of dog which is originally from South Africa.

Alaunt: The Alaunt is an extinct breed of dog, with the original breed having existed in central Asia and Europe from ancient times through the 17th century.  The Alaunt breed had three distinct phenotypes: Alaunt Veantre, Alaunt Boucherie and the Alaunt Gentile.  They all were large, short coated dogs of varying head-types.  The former two resembled the molosser type dogs much like the present-day Dogo Argentino or like the Caucasian Shepherd Dog except with short hair and a mesocephalic head which made them excellent large-game hunters.  The Alaunt was originally bred by the Alani tribes, the nomads of Indo-European Sarmatian ancestry who spoke an Iranian language.  The Alans were known as superb warriors, herdsmen, and breeders of horses and dogs.  The Alans bred their dogs for work and developed different strains within the breed for specific duties.  The breed was further developed in Spain, France, Germany, England, and in Italy.

Galgo Español: The Galgo Español ("Spanish galgo") or Spanish greyhound is an ancient breed of dog, specifically a member of the sighthound family.

Conformation (dog): Conformation in dogs refers solely to the externally visible details of a dog's structure and appearance, as defined in detail by each dog breed's written breed standard.  A dog that "conforms" to most of the items of description in its individual breed standard is said to have "good conformation".  Unlike equine conformation, there are no fixed rules for dog conformation, as dogs are the most variable in appearance of any animals ("Phenotypic variation among dog breeds, whether it be in size, shape, or behavior, is greater than for any other animal").  Instead, conformation in dogs is based on the dog type from which the breed developed, along with many details that have been added to the breed standard for purposes of differentiation from other breeds, for working reasons, or for enhancing the beauty of the animals from the viewpoint of the fanciers who wrote the breed standards.

Teddy Roosevelt Terrier: The Teddy Roosevelt Terrier is a small to medium-sized American hunting terrier.  Lower-set with shorter legs, more muscular, and heavier bone density than its cousin the American Rat Terrier.  There is much diversity in the history of the Teddy Roosevelt Terrier breed and it shares a common early history with the American Rat Terrier, Fox Paulistinha and Tenterfield Terrier.  It is said the Rat Terrier background stems from the terriers or other dogs that were brought over by early English and other working class immigrants.  Since the breed was a farm, hunting and utility dog there was little to no planned breeding other than breeding dogs with agreeable traits to each other in order to produce the desired work ethic in the dog.  It is assumed that the Feist (dog), Bull Terrier, Smooth Fox Terrier, Manchester Terrier, Whippet, Italian Greyhound, the now extinct English White Terrier, Turnspit dog and or Wry Legged Terrier all share in the Teddy Roosevelt Terrier's ancestry.  These early Ratting Terriers were then most likely bred to the Beagle or Beagle cross bred dogs (for increased scenting ability) and other dogs.  Maximizing the influences from these various breeds provides the modern Teddy Roosevelt Terrier with a keen sense of awareness and prey drive, an acute sense of smell and a very high intellect.  Although they tend to be aloof with strangers they are devoted companion dogs with a strong desire to please and be near their owners side at all times.

Airedale Terrier: The Airedale Terrier (often shortened to "Airedale"), also called Bingley Terrier and Waterside Terrier, is a dog breed of the terrier type that originated in the valley ("dale") of the River Aire, in the West Riding of Yorkshire, England.  It is traditionally called the "King of Terriers" because it is the largest of the terrier breeds.  The Airedale was bred from the Old English Black and Tan Terrier (now extinct), the Bull Terrier, the Otterhound and probably some other Terrier breeds, originally to serve as an all around working farm dog.  In Britain this breed has also been used as a war dog, guide dog and police dog.  In the United States, this breed has been used to hunt big game, upland birds, and water fowl, and serve in many other working capacities.

Supporting paragraphs: Galgo Español Boerboel
Answer: Boerboel