Question: what does Russian Spaniel and Broholmer have in common?

full_context: Document 1: Giant Schnauzer: The Giant Schnauzer is a working breed of dog developed in the 17th century in Germany. It is the largest of the three breeds of Schnauzerthe other two breeds being the Standard Schnauzer and the Miniature Schnauzer. Numerous breeds were used in its development, including the black Great Dane, the Bouvier des Flandres, and the German Pinscher. Originally bred to assist on farms by driving livestock to market and guarding the farmer's property, the breed eventually moved into the city, where it worked guarding breweries, butchers' shops, stockyards and factories. It was unknown outside of Bavaria until it became popular as a military dog during World War I and World War II.
Document 2: Cavalier King Charles Spaniel: The Cavalier King Charles Spaniel is a small spaniel classed as a toy dog by The Kennel Club and the American Kennel Club. It originated in the United Kingdom and is one of the more popular breeds in many countries. Since 2000, it has grown in popularity in the United States and ranks as the 18th most popular pure-breed in the United States (2013 Registration Statistics). It has a silky, smooth coat and commonly a smooth undocked tail. The breed standard recognizes four colours: Blenheim (chestnut and white), Tricolor (black/white/tan), Black and Tan, and Ruby. The breed is generally friendly, affectionate and good with both children and other animals; however, they require a lot of human interaction. Since they are a family dog, it is recommended to not leave them alone for long periods at a time. The expected average lifespan of a Cavalier King Charles Spaniel is under ten years.
Document 3: Broholmer: The Broholmer, also called the Danish Mastiff, is a large Molosser breed of dog from Denmark, recognized by the Danish Kennel Club and the Fédération Cynologique Internationale. It has been employed as a guard dog in the homes of the wealthy. The breed's numbers dwindled severely during World War II, but the dog made a successful return in the 1970s.
Document 4: Bullmastiff: The Bullmastiff is a large-sized breed of domestic dog, with a solid build and a short muzzle. The Bullmastiff shares the characteristics of molosser dogs, and was originally developed by 19th-century gamekeepers to guard estates. The breed's bloodlines are drawn from the English Mastiff and the extinct Old English Bulldog. It was recognized as a purebred dog by the English Kennel Club in 1924. They are quiet dogs and very rarely bark.
Document 5: Mastiff: Mastiff type means a large molosser dog. The term "mastiff type" has been used synonymously with the term "molosser". For example, the bulldog breeds, the Great Dane, the mountain dogs, the pit bulls and even smaller dogs such as the Boston terrier, may be considered "mastiff types" in this broad sense. The descriptive term, mastiff type, should not be confused with the breed, the Mastiff. All breeds are individual and should be referred to by their breed name to ensure correct identification.
Document 6: 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.
Document 7: American Cocker Spaniel: The American Cocker Spaniel is a breed of sporting dog. It is a spaniel type dog that is closely related to the English Cocker Spaniel; the two breeds diverged during the 20th century due to differing breed standards in America and the UK. In the United States, the breed is usually called the Cocker Spaniel, while elsewhere in the world, it is called the American Cocker Spaniel in order to differentiate between it and its English cousin, which was already known as "Cocker Spaniel" before the American variety was created. The word "cocker" is commonly held to stem from their use to hunt woodcock in England, while "spaniel" is thought to be derived from the type's origins in Spain.
Document 8: Welsh Springer Spaniel: The Welsh Springer Spaniel is a breed of dog and a member of the spaniel family. Thought to be comparable to the old Land Spaniel, they are similar to the English Springer Spaniel and historically have been referred to as both the Welsh Spaniel and the Welsh Cocker Spaniel. They were relatively unknown until a succession of victories in dog trials by the breed increased its popularity. Following recognition by The Kennel Club in 1902, the breed gained the modern name of Welsh Springer Spaniel. The breed's coat only comes in a single colour combination of white with red markings, usually in a piebald pattern. Loyal and affectionate, they can become very attached to family members and are wary of strangers. Health conditions are limited to those common among many breeds of dog, although they are affected more than average by hip dysplasia and some eye conditions. They are a working dog, bred for hunting, and while not as rare as some varieties of spaniel, they are rarer than the more widely known English Springer Spaniel with which they are sometimes confused.
Document 9: English Springer Spaniel: The English Springer Spaniel is a breed of gun dog in the Spaniel family traditionally used for flushing and retrieving game. It is an affectionate, excitable breed with a typical lifespan of twelve to fourteen years. They are very similar to the Welsh Springer Spaniel and are descended from the Norfolk or Shropshire Spaniels of the mid-19th century; the breed has diverged into separate show and working lines. The breed suffers from average health complaints. The show-bred version of the breed has been linked to "rage syndrome", although the disorder is very rare. It is closely related to the Welsh Springer Spaniel and very closely to the English Cocker Spaniel; less than a century ago, springers and cockers would come from the same litter. The smaller "cockers" hunted woodcock while the larger littermates were used to flush, or "spring," game. In 1902, The Kennel Club recognized the English Springer Spaniel as a distinct breed. They are used as sniffer dogs on a widespread basis. The term "Springer" comes from the historic hunting role, where the dog would flush (spring) birds into the air.
Document 10: English Mastiff: The English Mastiff is a breed of extremely large dog (often known simply as the Mastiff) perhaps descended from the ancient Alaunt and Pugnaces Britanniae, with a significant input from the Alpine Mastiff in the 19th century. Distinguishable by enormous size, massive head, and a limited range of colours, but always displaying a black mask, the Mastiff is noted for its gentle and loving nature. The lineage of modern dogs can be traced back to the early 19th century, but the modern type was stabilised in the 1880s and refined since. Following a period of sharp decline, the Mastiff has increased its worldwide popularity. Throughout its history, the Mastiff has contributed to the development of a number of dog breeds, some generally known as Mastiff-type dogs, or, confusingly, just as "Mastiffs".
Document 11: Russian Spaniel: The Russian Spaniel is a type of spaniel first standardised in 1951 in the Soviet Union after World War II by cross breeding English Cocker Spaniels, English Springer Spaniels and other spaniel breeds. Physically it is similar to a Cocker Spaniel, but has a shorter, tighter coat and a longer body. Developed and used as hunting dogs, this breed does not suffer from any major health complaints other than those normally associated with spaniels. Popular in its native Russia, the breed was only introduced overseas in the 1990s, and is not yet recognised by any major kennel clubs.
Document 12: Cocker Spaniel: Cocker Spaniels are dogs belonging to two breeds of the spaniel dog type: the American Cocker Spaniel and the English Cocker Spaniel, both of which are commonly called simply "Cocker Spaniel" in their countries of origin. In the early 20th century, Cocker Spaniels also included small hunting Spaniels.
Document 13: Neapolitan Mastiff: The Neapolitan Mastiff or Mastino (Italian: "Mastino Napoletano" ) is a large, ancient dog breed. This massive breed is often used as a guard and defender of family and property due to their protective instincts and their fearsome appearance.
Document 14: Russkiy Toy: The Russian Toy (also known as the Russian Toy Terrier, and in Russia as the Russkiy Toy, Toychik,Russian: Русский той, Тойчик ) is a very small breed of dog originally bred in Russia from the English Toy Terrier which is known today as the Manchester Terrier. There are two types of coats in the breed: smooth coat and long coat. The smooth-coated variety was previously known as the Russian Toy Terrier and long-coated as the Moscow Long Haired Toy Terrier. Both were brought together under the same Russian Toy Terrier name in 1988 and the "Terrier" was dropped from the name when the breed was added in 2006 to the official list of breeds registered with the Fédération Cynologique Internationale and has been registered in the Foundation Stock Service of the American Kennel Club since 2008, allowed to compete in AKC companion events since 2010. The first official breed standard of the two varieties was written in 1966 in Russia.
Document 15: Dogue de Bordeaux: The Dogue de Bordeaux, Bordeaux Mastiff, French Mastiff or Bordeauxdog is a large French Mastiff breed—and one of the most ancient French dog breeds. A typical brachycephalic molossoid type breed, the Bordeaux is a very powerful dog, with a very muscular body. This brawny breed has been put to work in many different capacities, from pulling carts and hauling heavy objects, to guarding flocks and, historically, the castles of the European elite.
ground_truth: dog