Razor's Edge kennel began selectively breeding pit bull terriers for particular characteristics in the 1980s. Dogs descended from this breeding program are referred to as Razor's Edge bullies or Razor's Edge pit bulls.
The dogs selected for in the Razor's Edge program were stocky, strong-chested and had short muzzles. They were also selected for a calm, mellow temperament suitable for a companion, rather than a working-type pit bull terrier. The American Bully Kennel Club promotes the use of the word "bully" to describe a dog of pit bull ancestry that is of stocky build but with the aggressiveness and gameness bred out of it.