Question: The Staffordshire Bull Terrier and Galgo Español are both what type of animal?
Context: Luke the Dog (1913-1926) was a Staffordshire Bull Terrier that performed as a recurring character in American silent comedy shorts between 1914 and 1920.  He was also the personal pet of actress Minta Durfee and her husband, the comedian and director Roscoe "Fatty" Arbuckle.  Although Luke never came close to attaining the stardom of the various dogs that portrayed Rin Tin Tin, Pete the Pup, or Lassie, he accomplished stunts on camera that even those later canine colleagues may have found difficult or impossible to duplicate.  Luke for six years gained widespread popularity among movie audiences, appearing in one- and two-reelers for Keystone Studios, Comique Film Company, and Joseph M. Schenck Productions.  The bull terrier shared screen time not only with Arbuckle and Durfee but also with other stars and top supporting players of the silent era, including Mabel Normand, Buster Keaton, Al St. John, Molly Malone, Joe Roberts, Betty Compson, and Edgar Kennedy. The Galgo Español ("Spanish galgo") or Spanish greyhound is an ancient breed of dog, specifically a member of the sighthound family. The Staffordshire Bull Terrier is a medium-sized, short-coated breed of dog of English lineage and may be considered to be within the pit bull type. The Bull and Terrier is a breed of dog that was the progenitor of the American Pit Bull Terrier, American Staffordshire Terrier, English Bull Terrier and the Staffordshire Bull Terrier. The American Pit Bull Terrier (APBT) is a dog breed.  It is a medium-sized, solidly-built, intelligent, short-haired dog whose early ancestors came from the British Isles.  When compared with the English Staffordshire Bull Terrier (another breed within the type commonly called pit bulls), the American Pit Bull Terrier is larger by margins of 6 - in height and 25 - in weight.  The American Pit Bull Terrier varies in size.  Males normally are about 18-21 inches (45–53 cm) in height and around 35-60 pounds (15–27 kg) in weight.  Females are normally around 17-20 inches (43–50 cm) in height and 30-50 pounds (13–22 kg) in weight. Watchman is a military mascot of the now disbanded Staffordshire Regiment and the now withdrawn 3rd Battalion (STAFFORDS) of the Mercian Regiment.  He is a Staffordshire Bull Terrier.  He continues his duties as part of the Staffordshire Regimental Association. Pit bull is the common name for a type of dog.  Formal breeds often considered in North America to be of the pit bull type include the American Pit Bull Terrier, American Staffordshire Terrier, American Bully, and Staffordshire Bull Terrier.  The American Bulldog is also sometimes included.  Many of these breeds were originally developed as fighting dogs from cross breeding bull-baiting dogs (used to hold the faces and heads of larger animals such as bulls) and terriers.  After the use of dogs in blood sports was banned, such dogs were used as catch dogs in the United States for semi-wild cattle and hogs, to hunt and drive livestock, and as family companions.  Despite dog fighting now being illegal in the United States, it still exists as an underground activity, and pit bulls are a common breed of choice. Ch.  Rocky Top's Sundance Kid ("aka: "Rufus"") (April 8, 2000 – August 9, 2012), is a Bull Terrier who is best known for being the 2006 Best In Show winner at the Westminster Dog Show.  He is the first Colored Bull Terrier to win Best in Show at Westminster, with the only other victory for his breed going to a White Bull Terrier in 1918.  He also won Best in Show at the National Dog Show in 2005, and on retirement trained as a therapy dog.  He is the most successful Colored Bull Terrier Show Dog of all time. The American Staffordshire Terrier, also known as "Amstaff" (in the United States) or simply "Stafford", is a medium-sized, short-coated American dog breed.  It is one of several breeds commonly known as pit bulls.  In the early part of the twentieth century the breed gained social stature and was accepted by the American Kennel Club in 1936.  The name was changed to reflect difference from the Staffordshire Bull Terrier of England. The Chamuco (a Mexican word which means "devil") or Mexican Pitbull is a dog breed not recognized by any Canofile association.  It originated in the center of Mexico, it was developed in this country in the 1970s, product of the accidental or intentional crosses of the American Pit Bull Terrier with the now extinct Mexican Bulldog, street dogs, American Bully, Pitbull Blue, Staffordshire bull terrier, American Staffordshire Terrier, and probably with the Boxer.  Its name comes from the Mexican slang "Chamuco", which means devil because of its temperament and tenacity.  Also it called Mexican pitbull or miniature pitbull, but actually is Dogo of Mexican origin.
Answer: dog