Question: Which dog is from Russia, Moscow Water Dog or Dogo Cubano?

Context paragraphs:
Grief therapy dog: A grief therapy dog (also known as an emotional support dog, companion dog, or comfort dog) is a form of animal-assisted therapy.  Dogs have been proven to be able to assist people in overcoming grief, which has led to a recent rise in the use of therapy dogs; although animal-assisted therapy theory has been around since World War II.  Grief therapy dogs can be found in locations such as funeral homes, hospitals, nursing homes, schools, and hospices, and may provide support in situations such as funeral services, counseling sessions, and disaster relief.  Popular breeds used as therapy dogs include the Portuguese Water Dog, Bernese Mountain Dog, St. Bernard, and Golden Retriever.

FCI Retriever, Flushing Dog and Water Dog Group: The Retriever, Flushing Dog and Water Dog Group is a designation used only by the Fédération Cynologique Internationale for a group of dog breeds consisting of Retrievers, Flushing Dogs and Water Dogs.

Tweed Water Spaniel: The Tweed Water Spaniel, or Tweed Spaniel, is a breed of dog extinct since the 19th century.  It is best known for being involved in the early development of the modern Curly Coated Retriever and Golden Retriever breeds of dogs.  They were described as a generally brown athletic dogs from the area around Berwick-upon-Tweed near the River Tweed and close to the Scottish Borders.  A type of water dog, the breed was not well known outside the local area.  This breed may have been created by crossing local water dogs with imported St. John's water dog, another breed which is also now extinct.

Wetterhoun: The Wetterhoun (FCI No.221, translated into English as the Frisian Water Dog) is a breed of dog traditionally used as a hunting dog for hunting small mammals and waterfowl in the province of Fryslan in the Netherlands.  The name of the dog comes from the West Frisian "Wetterhûn" meaning "water dog."  Plural of Wetterhoun is Wetterhounen in Dutch.  The breed may also be called the "Otterhoun" (not to be confused with the Otterhound) or "Dutch Spaniel", although it is not a Spaniel-type dog.

Spanish Water Dog: The Spanish Water Dog (perro de agua español ) breed dates back several hundred years and has its origins most likely in Turkey from where it was imported into Spain as a general purpose sheepdog and guard.  It is also used sometimes as a gundog, and is skilled at retrieval from water.  The SWD has strong genetic links to other ancient water breeds such as the Portuguese Water Dog, the French Barbet and the Irish Water Spaniel.

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.

Moscow Water Dog: The Moscow Water Dog, also known as the Moscow Diver, Moscow Retriever or Moskovsky Vodolaz, is a little-known dog breed derived from the Newfoundland, Caucasian Shepherd Dog and East European Shepherd.  It is now extinct, but was used in the development of the  Black Russian Terrier.  The Moscow Water Dog was produced only by the Red Star Kennels, the state operated organization chartered to provide working dogs for the armed services.

Bo (dog): Bo (born October 9, 2008) is a pet dog of the Obama family, the former First Family of the United States.  Bo is a male Portuguese Water Dog.  President Barack Obama and his family were given the dog as a gift after months of speculation about the breed and identity of their future pet.  The final choice was made in part because Malia Obama's allergies dictated a need for a hypoallergenic breed.  Bo has occasionally been called "First Dog".  In August 2013, Bo was joined by Sunny, a female dog of the same breed.

St. John's water dog: The St. John's water dog, also known as the St. John’s dog or the lesser Newfoundland, was a landrace (a dog bred for a purpose, not pedigree or appearance) of domestic dog from Newfoundland.  Little is known of the types that went into its genetic makeup, although it was probably a random-bred mix of old English, Irish and Portuguese working dogs.  The number of St. John's water dogs started declining by the start of the 20th century.  By the early 1980s, the variety was extinct.

Dogo Cubano: Dogo Cubano also known as the Cuban Mastiff, Cuban Dogo and Cuban Dogge is an extinct dog breed from Cuba.  It was of the Bull Mastiff type and was used for dog fighting.

Supporting paragraphs: Moscow Water Dog Dogo Cubano
Answer: Moscow Water Dog