Big Country Outdoors

First off, the Term “pit bull” is not a breed but a group of three separate breeds bred for the same purpose. The American Staffordshire Terrier, The American Pit Bull Terrier, and The Staffordshire Bull Terrier

Second the color patter you are referring to is known as Brindle

http://www.pitbulllovers.com/american-pit-bull-terrier-pics.html