There were a few different factors that caused the St John's Water Dog to go extinct which were an attempt to encourage sheep raising, heavy restrictions and taxes were placed on dog ownership during the 19th century.
The St. John's water dog, also known as the St. John's dog or the lesser Newfoundland, is an extinct landrace 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 biggest extinct dog is the Mesopotamian Molossus.
The Mesopotamian Molossus was an ancient Mesopotamian guard dog breed that existed as far back as 2000-5000BC.
Heavy-boned, massive, muscular, and intimidating, the original Molossus was charged with protecting villages, people, children, and other animals from predators and enemies.
The biggest dog is a Great Dane.
More specifically a Great Dane named Zeus was the biggest dog and biggest Great Dane dog.
Zeus was a Great Dane from Otsego, Michigan, United States, famous for being named the "world's tallest dog" by the 2012 and 2013 Guinness Book of World Records.
Standing on his hind legs, Zeus stretched 7 feet 5 inches, and when measured in October 2011, Zeus was 3 feet 8 inches from his foot to his withers.
The smartest dog is the border collie.
The Border Collie is a British breed of herding dog of medium size.
They are descended from landrace sheepdogs once found all over the British Isles, but became standardized in the Anglo-Scottish border region.
Presently they are used primarily as working dogs to herd livestock, specifically sheep.
Dogs cannot join a wolf pack.
If a dog were to run away and come up against wolves the wolves would likely get into a fight with the dog as they would not know the dog or know the dog wants to be a part of their pack.
Wolves are far more aggressive than dogs, and they display territorial behavior that could lead to attacks.
Not even every member of the household is safe.
Some wolf-dog owners have discovered that their wolves became aggressive towards them in certain circumstances, despite a lifetime of companionship.
However some dogs are stronger than some wolves and could some dogs could fend off a wolf.
Dogs are less fearful and more playful than their wolf cousins.
Wolves have yellow eyes, whereas dogs more commonly have brown or blue eyes.
Wolves are built to run with narrow chests and long legs, whereas the domestic dog tends to be wider and stockier.
Dogs tend to be less mentally mature than a wolf of similar age.
Wolves do better on some tests of logic than dogs, a new study found, revealing differences between the animals that scientists suspect result from dogs' domestication.
The dog or domestic dog is a domesticated descendant of the wolf, and is characterized by an upturning tail.
The dog is derived from an ancient, extinct wolf, and the modern wolf is the dog's nearest living relative.