The Staffordshire Bull Terrier is a powerful and muscular dog, very strong for his size with a broad head and very strong jaws. Dark preferable, but may bear some relation to coat color. 
 
Round, of medium size, and set to look straight ahead. Light eyes or pink eye rims to be considered a fault, except that where the coat surrounding the eye is white the eye rim may be pink. 
 
Ears--Rose or half-pricked and not large. Full drop or full prick to be considered a serious fault. 
 
Mouth--A bite in which the outer side of the lower incisors touches the inner side of the upper incisors. The lips should be tight and clean. The coat is smooth, short and close to the skin, not to be trimmed or de-whiskered. 
 
Colors include red, fawn, white, black or blue, or any of these colors with white. Any shade of brindle or any shade of brindle with white. Black-and-tan or liver color to be disqualified. 
 
The tail is medium length, low set, tapering to a point and carried rather low. Should not curl much and may be likened to an old fashioned pump handle. Lips tight and clean. Jaws strong, teeth large, with a perfect, regular and complete scissor bite, i.e. upper teeth closely overlapping lower teeth and set square to the jaws. Rose or half pricked ears, not large or heavy. Full, drop or pricked ears highly undesirable.
  
Living conditions
The Staffordshire Bull Terrier will do okay in an appartment if it is sufficiently exercised. It is very active indoors and will do okay with a small yard.
 
Origins
The Staffordshire Bull Terrier was developed in the region of Staffordshire, England in the nineteenth century from crosses between Bulldogs and various Terriers. The Staffordshire Bull was developed for the then-popular sport of bull baiting. The breed's popularity waned as interest in the sport waned. Then, in the twentieth century, interest in the breed grew again, especially in the United States. It returned to the show ring in 1935. In the U.S. it is now well bred in a size slightly larger than that called for in the European standard. The Staffordshire Bull Terrier is not a dog for every family, but in the hands of a dominant, experienced owner; it can be a successful pet and family guardian.


Staffordshire Bull Terrie Standard

General Appearance
Smooth-coated, well balanced, of great strength for his size. Muscular, active and agile.

Characteristics
Traditionally of indomitable courage and tenacity. Highly intelligent and affectionate especially with children.

Temperament
Bold, fearless and totally reliable.

Head and Skull
Short, deep though with broad skull. Very pronounced cheek muscles, distinct stop, short foreface, nose black.

Eyes
Dark preferred but may bear some relation to coat colour. Round, of medium size, and set to look straight ahead. Eye rims dark.

Ears
Rose or half pricked, not large or heavy. Full, drop or pricked ears highly undesirable.

Mouth
Lips tight and clean. Jaws strong, teeth large, with a perfect, regular and complete scissor bite, i.e. upper teeth closely overlapping lower teeth and set square to the jaws.

Neck
Muscular, rather short, clean in outline gradually widening towards shoulders.

Forequarters
Legs straight and well boned, set rather wide apart, showing no weakness at the pasterns, from which point feet turn out a little. Shoulders well laid back with no looseness at elbow.

Body
Close-coupled, with level topline, wide front, deep brisket, well sprung ribs; muscular and well defined.

Hindquarters
Well muscled, hocks well let down with stifles well bent. Legs parallel when viewed from behind.

Feet
Well padded, strong and of medium size. Nails black in solid coloured dogs.

Tail
Medium length, low-set, tapering to a point and carried rather low. Should not curl much and may be likened to an old-fashioned pump handle.

Gait/Movement
Free, powerful and agile with economy of effort. Legs moving parallel when viewed from front or rear. Discernible drive from hindlegs.

Coat
Smooth, short and close.
Colour
Red, fawn, white, black or blue, or any one of these colours with white. Any shade of brindle or any shade of brindle with white. Black and tan or liver colour highly undesirable.

Size
Desirable height at withers 36-41 cms (14 to 16 ins), these heights being related to the weights. Weight: dogs: 13-17 kgs (28-38 lbs); bitches 11-15.4 kgs.

Faults
Any departure from the foregoing points should be considered a fault and the seriousness with which the fault should be regarded should be in exact proportion to its degree and its effect upon the health and welfare of the dog.

Note
Male animals should have two apparently normal testicles fully descended into the scrotum.

Source: Kennel Club UK