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"Uh, no domestic dog is a "natural" breed. They have all been bred by humans, and for thousands of years."
THANK YOU for helping me to make the point! Of all the popular breeds out there, we have hunting dogs, watch dogs, cattle dogs, lap dogs, etc. They have all been bred to have specific traits and characteristics, most of which can be made into great family pets. Oddly, and just a side point, a lot of the best dogs out there are mutts. Heinz 57 variety. But have a read here about the traits and characteristics that were carefully and deliberately bred into this particular breed, "pit bull" dogs:
"Pit bull is the common name for a type of dog. Formal breeds often considered of the pit bull type include the American Pit Bull Terrier, American Staffordshire Terrier, and Staffordshire Bull Terrier.[1] Many of these breeds were originally developed as fighting dogs from cross breeding bull-baiting dogs (used to hold the faces and heads of larger animals such as bulls) and terriers.[2] After the use of dogs in blood sports was banned, such dogs were used as catch dogs in the United States for semi-wild cattle and hogs, to hunt and drive livestock"
Source: Wikipedia.