Pitbull centuries back

The blue nose pitbull has become one of the most popular coat and nose color variation of the breed. As dog breeders become smarter and skillful in marketing their dogs, they are realizing that they can easily increase their bottom line by marketing their dogs on the platform of certain “noble physical traits or attributes” and portraying these traits as unique, rare or outstanding.

The pitbull (including the pitbull blue nose) is not a specific breed of dog but a name for a type of dog that share common physical and behavioral traits. The classes of dog breeds that constitute the pitbull are American pitbull terrier, American bulldog, Staffordshire bull terrier, American Staffordshire terrier and any other purebred or breed crossed with any of these breeds.

Over 1,000 years ago in England, bull dogs were bred and used in the blood sport of bull baiting, a British pastime that involves tying a bull to the stake and setting these specially bred and trained bull dogs to attack them with the primary objective of seizing and holding the bulls by the nose as this was the most tender part of the bull. The bull dog breed was selectively bred into a powerful muscular breed with tremendous jaw power and the ability to bite and hold on with unyielding tenacity that even when it was violently tossed in the air by the bull it will not let go except its teeth got broken.

http://www.aboutdogfacts.com/blue-nose-pitbull/

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