Question: Which breed of dog, Brazilian Dogo or Tahltan Bear Dog, is a Molosser-type working dog breed?

Context paragraphs:
Breed standard (dogs): A breed standard (also called bench standard or the standard) in the dog fancy is a set of guidelines covering specific "externally observable" qualities such as "appearance", "movement", and "temperament" for that dog breed.  Breed standards are not scientific documents, but are written for each breed by clubs of hobbyists called breed clubs for their own specific requirements.  Details and definitions within breed standards for a specific dog breed may vary from breed club to breed club and from country to country.  Dog breed standards are similar in form and function to breed standards for other domesticated animals.

Tahltan Bear Dog: The Tahltan Bear Dog was a breed of dog that was indigenous to Canada.  This breed is believed to be extinct by most authorities.

Brazilian Dogo: Brazilian Dogo(Portuguese: "Dogue Brasileiro" ), also called Brazilian Dogge, is a Molosser-type working dog breed originating in Brazil.  It is neither recognized by the Fédération Cynologique Internationale (FCI) nor the American Kennel Club (AKC).  However, it has the official national recognition of the Confederação Brasileira de Cinofilia(CBKC) where it belongs to the Group 11 - Breeds not recognized by the FCI ("Raça não reconhecida pela FCI").

Kerry Blue Terrier: The Kerry Blue Terrier (also known as the Irish Blue Terrier) () is a breed of dog.  Originally bred to control "vermin" including rats, rabbits, badgers, foxes, otters and hares, over time the Kerry became a general working dog used for a variety of jobs including herding cattle and sheep, and as a guard dog.  Today the Kerry has spread around the world as a companion and working dog.  Despite a Kerry Blue winning Crufts (the most important UK dog show) in 2000, it remains an "unfashionable" breed, and is distinctly uncommon; however, it not as threatened as some of the other terrier breeds such as Skye Terrier, Sealyham Terrier, and Dandie Dinmont Terrier.

Guatemalan Dogo: Guatemalan Dogo ("Dogo Guatemalteco"), formerly known as the Guatemalan Bull Terrier ("Bullterrier Guatemalteco"), and Guatemalan Mastiff, is a Molosser-type dog breed originating in Guatemala.  It is neither recognized by the Fédération Cynologique Internationale (FCI) nor the American Kennel Club (AKC).  However, it has the official national recognition of the Asociación Canofila Guatemalteca (ACANGUA) where it belongs to the Group 2.2.1 - Mastiffs.  As the unique breed originating in Guatemala, it is also the national dog of the country.  Nowadays it has spread to various other countries, such as the USA.

German Shepherd: The German Shepherd (German: Deutscher Schäferhund , ] ) is a breed of medium to large-sized working dog that originated in Germany.  The breed's officially recognized name is German Shepherd Dog in the English language (sometimes abbreviated as "GSD").  The breed is also known as the Alsatian in Britain and Ireland.  The German Shepherd is a relatively new breed of dog, with their origin dating to 1899.  As part of the Herding Group, German Shepherds are working dogs developed originally for herding sheep.  Since that time however, because of their strength, intelligence, trainability, and obedience, German Shepherds around the world are often the preferred breed for many types of work, including disability assistance, search-and-rescue, police and military roles, and even acting.  The German Shepherd is the second-most registered breed by the American Kennel Club and fourth-most registered breed by The Kennel Club in the United Kingdom.

Blue Lacy: The Lacy Dog or Blue Lacy Dog is a breed of working dog that originated in Texas in the mid-19th century.  The Lacy was first recognized in 2001 by the Texas Senate.  In Senate Resolution No. 436, the 77th Legislature honored the Lacy as "a true Texas breed".  In June 2005, Governor Rick Perry signed the legislation adopting the Blue Lacy as "the official State Dog Breed of Texas".  As expected, the vast majority of Lacy dogs are found in Texas.  However, as the breed becomes more well recognized, there are breeding populations being established across the United States, Canada, and most recently in Europe.

Lurcher: The lurcher is the offspring of a sighthound mated with another breed, most commonly a pastoral breed or a terrier type of dog.  Brian Plummer identifies the Norfolk lurcher as the predecessor of the modern lurcher.  While not a pure breed, it is generally a cross between a sighthound and a working dog breed.  Collie crosses are popular, given the working instinct of a sheepdog when mated with a sighthound gives a dog of great intelligence plus speed—prerequisites for the hunter/poacher.  In the US midwest, crosses with large scent hounds are fairly common.

Perro de Presa Canario: The Perro de Presa Canario, A.K.A. the Canary Mastiff, is a large Molosser-type dog breed originally bred for working livestock.  The name of the breed is Spanish, means "Canarian catch dog", and is often shortened to "Presa Canario" or simply "Presa".  The breed is sometimes also called Dogo Canario, meaning "Canarian Molosser".  It is the animal symbol of the island of Gran Canaria.

Kumaon Mastiff: The Kumaon Mastiff (Kumauni: सिप्रो कुकुर), also known as the Indian Mastiff and Bulli, is a rare Molosser-type working breed of dog originating in Uttarakhand state of India.  Originally bred as a watch dog and livestock guardian in the hills of Kumaon, this dog is rare even in the region of its origin.

Supporting paragraphs: Brazilian Dogo Tahltan Bear Dog
Answer: Brazilian Dogo