The pit bull's ancestry can be traced back to roughly the 12th century, when European hunters cross-bred the molossus, an early mastiff, with the Bellenbeiser, or bull-biter--which became known as...
There head should have a square shape to it, it should have a slender and fine body shape and should have a bit of muscle.
It is a verebrate.
The following link has answers you would like referring to a "pit bull". http://en.wikipedia.org/wiki/Pit_Bull
Most Pit Bull Terriers, or American Staffordshire Terriers, are between 43-48cm (17-19in).