Question: Which dog is larger, the Alpine Mastiff or the Mountain Cur?

Context paragraphs:
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.

Cane da presa: The Cane da Presa Meridionale (Italian for "Southern Catching Dog") is the old, "functional" working variant of the Neapolitan Mastiff.  Before 1946 there was no distinction between Neapolitan Mastiff, Cane da Presa and Cane Corso, these were simply three different names for the same dog.  The modern Neapolitan Mastiff is unlike the original, a dog created by dog shows. Fans of the original Mastino have started an organisation which is trying to gather the remaining specimens which would fit the 1946 standard of the Neapolitan Mastiff.

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".

Stephens Cur: The Stephens Cur (a.k.a. Stephens' Stock Cur), is a scent hound that belongs to the Cur dog breed.  They were originally bred by the Stephens family in southeastern Kentucky.  The dogs known as "Little black dog" were bred by generations of that family for over a century.  In 1970, they were recognized as separate and distinct breed of Cur.  The dog is mostly black with white markings, but more than a third white is not permissible.  It is good for hunting raccoon and squirrel, but can also be used to bay wild boar.  They are registered with the United Kennel Club

Fila Brasileiro: The Fila Brasileiro (] ) also known as the Brazilian Mastiff is a large working breed of dog developed in Brazil.  It is known for its superb tracking ability, aggressiveness and an unforgiving impetuous temperament.  When a Brazilian Mastiff finds its quarry, it does not attack it, but rather holds it at bay until the hunter arrives.  Owing to these qualities, the Brazilian Mastiff is used as a guard dog, as a shepherd dog for herding livestock and as a hunting dog for tracking and controlling large prey.  When slavery was legal in Brazil, the Brazilian Mastiff was used to return fugitives unharmed to their slave masters.  This breed has been banned in many countries because of its temperament and potential for aggression.

Cur: The term cur refers to the lowest class of nameless dog or Pariah Dog, generally a mixed-breed dog.  Originally the word "cur" referred to a certain English purpose-bred, short-tailed cattle driving dog known only from historical records, the cur dog, but in modern usage it applies to any mixed-breed.

Treeing Cur: The Treeing Cur is a breed of dog that originated in the mid-west and was first recognized by United Kennel Club on November 1, 1998, due to the efforts of Alex and Ray Kovac.  "Most Cur breeders were not well off and so they required a dog that could serve multiple purposes: hunter, guardian, and stock dog.  The result was the Treeing Cur, "which is the most varied in size and colors of the Cur breeds", according to United Kennel Club.They are primarily used to tree squirrels, raccoons, opossums, wild boars, bears, mountain lions and bobcats as well as to hunt big game.

Alpine Mastiff: The Alpine Mastiff is an extinct Molosser dog breed, the progenitor of the St. Bernard, and a major contributor to the modern Mastiff (through such dogs as "Couchez"), as well as to other breeds that derive from these breeds or are closely related to them.  M.B. Wynn wrote, "In 1829 a vast light brindle dog of the old Alpine mastiff breed, named L'Ami, was brought from the convent of Great St. Bernard, and exhibited in London and Liverpool as the largest dog in England."  William Cavendish, 5th Duke of Devonshire, is believed to have bred Alpine Mastiffs at Chatsworth House.

Mountain Cur: The Mountain Cur is a type of working dog that is bred specifically for treeing and trailing small game, like squirrel and raccoons.  They are also used for hunting and baying big game like bear and wild boar as well as being an all-purpose farm dog.  Curs are a member of the Hound group, and the Mountain Cur is one of several varieties of cur.  It can also be used as a water dog.  Mainly bred in Ohio, Kentucky, Virginia, and Tennessee, it has been registered with the United Kennel Club since 1998.  The Mountain Cur Breeder's Association was formed in 1957.

Catahoula Cur: The Catahoula Cur is an American dog breed named after Catahoula Parish, Louisiana, United States.  Also known as the Catahoula Leopard Dog, it became the state dog of Louisiana in 1979.  The breed is sometimes referred to as the "Catahoula Hound" or "Catahoula Leopard Hound" because of its spots, although it is not a true hound but a cur.  It is also called the "Catahoula Hog Dog", reflecting its traditional use in hunting wild boar.

Supporting paragraphs: Alpine Mastiff Mountain Cur
Answer: The Alpine Mastiff