American Bully is a dog that was created in the late 1900's. They are often mistaken as Pit Bulls, and though the "breed" is descended from pit bulls, they do not conform to the American Pit Bull's breed type. There is a new breed kennel club, called the American Bully Kennel Club. 
These dogs have been created by mating American pit bull terriers (UKC) with American Staffordshire Terriers (AKC).
As adapted from dogbreedinfo.com
Coat and Color
American Bully has a short, close, stiff to the touch, and glossy coat. All colors and patterns are acceptable.
Height and Weight
Height: Males 18 - 21 inches (46-53 cm) Females 17 - 20 inches (43-51 cm) There is no particular weight for the breed.
Body Head- Medium length, deep through, broad skull, very pronounced cheek muscles, distinct stop, and high set ears.
Ears- can be cropped or uncropped.
Eyes - All colors except albinism. Round to oval, low down in skull and set far apart.
Muzzle - Medium length, rounded on upper side or slightly squared to fall away abruptly below eyes. Jaws well defined. Under jaw to be strong and display biting power. Lips close and even, some looseness accepted, but not preferred.
Teeth- Upper teeth to meet tightly outside lower teeth in front or scissor bite accepted.
Nose- all colors acceptable.
Neck- heavy, slightly arched, tapering from shoulders to back of skull. No looseness of skin. Medium length.
Shoulders- strong and muscular with blades wide and sloping.
Back- The back is fairly short. Slight sloping from withers to rump or straight accepted with gentle short slope at rump to base of tail. Slightly higher rears accepted, but not encouraged.
Body- The body has well-sprung ribs, deep in rear. All ribs close together. Forelegs set rather wide apart to permit chest development. Chest deep and broad.
Tail- The tail is short in comparison to size, low set, tapering to a fine point; not curled. Not docked.
Front legs- should be straight. A slight turning outwards of the feet is accepted but not desired, large or round bones, pastern upright. No resemblance of bend in front.
Hindquarters- well-muscled, let down at hocks, turning neither in nor out.
Feet- of moderate size, well-arched and compact.
Gait- should be springy with drive off the rear.
Faults- Kinked or knotted tails, pink eyes and any form of albinism, tail too long or curled, undershot or overshot mouths, severe turned fronts, and aggressive behavior towards animals and humans.