According to The UKC, This Is The Description of an American Pit bull Terrier

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  AMERICAN PIT BULL TERRIER (REVISED NOVEMBER 1, 2008)
Terrier Group
View Registration Requirements

Revised November 1, 2008
©Copyright 1978, United Kennel Club, Inc..

HISTORY
    Sometime during the nineteenth century, dog fanciers in England, Ireland and Scotland began to experiment with crosses between Bulldogs and Terriers, looking for a dog that combined the gameness of the terrier with the strength and athleticism of the Bulldog. The result was a dog that embodied all of the virtues attributed to great warriors: strength, indomitable courage, and gentleness with loved ones. Immigrants brought these bull and terrier crosses to the United States. The American Pit Bull Terrier’s many talents did not go unnoticed by farmers and ranchers who used their APBTs as catch dogs for semi-wild cattle and hogs, to hunt, to drive livestock, and as family companions. Today, the American Pit Bull Terrier continues to demonstrate its versatility, competing successfully in Obedience, Tracking, Agility and Weight Pulls, as well as Conformation.

    The United Kennel Club was the first registry to recognize the American Pit Bull Terrier. UKC founder C. Z. Bennett assigned UKC registration number 1 to his own APBT, Bennett’s Ring, in 1898.

GENERAL APPEARANCE
    The American Pit Bull Terrier is a medium-sized, solidly built, short-coated dog with smooth, well-defined musculature. This breed is both powerful and athletic. The body is just slightly longer than tall, but bitches may be somewhat longer in body than dogs. The length of the front leg (measured from point of elbow to the ground) is approximately equal to one-half of the dog’s height at the withers. The head is of medium length, with a broad, flat skull, and a wide, deep muzzle. Ears are small to medium in size, high set, and may be natural or cropped. The relatively short tail is set low, thick at the base and tapers to a point. The American Pit Bull Terrier comes in all colors and color patterns except merle. This breed combines strength and athleticism with grace and agility and should never appear bulky or muscle-bound or fine-boned and rangy. Above all else, the APBT must have the functional capability to be a catch dog that can hold, wrestle (push and pull) and breathe easily while doing its job. Balance and harmony of all parts are critical components of breed type.

    Very Serious Fault: Any disproportionate overdone characteristic (such as short legs, excessive bone or massive head or body) that would interfere with working ability.

CHARACTERISTICS
    The essential characteristics of the American Pit Bull Terrier are strength, confidence, and zest for life. This breed is eager to please and brimming over with enthusiasm. APBTs make excellent family companions and have always been noted for their love of children. Because most APBTs exhibit some level of dog aggression and because of its powerful physique, the APBT requires an owner who will carefully socialize and obedience train the dog. The breed’s natural agility makes it one of the most capable canine climbers so good fencing is a must for this breed. The APBT is not the best choice for a guard dog since they are extremely friendly, even with strangers. Aggressive behavior toward humans is uncharacteristic of the breed and highly undesirable. This breed does very well in performance events because of its high level of intelligence and its willingness to work.

    HEAD
      The APBT head is unique and a key element of breed type. It is large and broad, giving the impression of great power, but it is not disproportionate to the size of the body. Viewed from the front, the head is shaped like a broad, blunt wedge. When viewed from the side, the skull and muzzle are parallel to one another and joined by a well defined, moderately deep stop. Supraorbital arches over the eyes are well defined but not pronounced. The head is well chiseled, blending strength, elegance, and character.

      Very Serious Fault: Overly large, heavy heads.

      SKULL - The skull is large, flat or slightly rounded, deep, and broad between the ears. Viewed from the top, the skull tapers just slightly toward the stop. There is a deep median furrow that diminishes in depth from the stop to the occiput. Cheek muscles are prominent but free of wrinkles. When the dog is concentrating, wrinkles form on the forehead, which give the APBT his unique expression.

      MUZZLE - The muzzle is broad and deep with a very slight taper from the stop to the nose, and a slight falling away under the eyes. The length of muzzle is shorter than the length of skull, with a ratio of approximately 2:3. The topline of the muzzle is straight. The lower jaw is well developed, wide and deep. Lips are clean and tight.

      Faults: Snipey muzzle; flews; weak lower jaw.

      Very Serious Fault: Muzzle too short, which impairs breathing capability.

      TEETH - The American Pit Bull Terrier has a complete set of evenly spaced, white teeth meeting in a scissors bite.

      Fault: Level bite.

      Serious Faults: Undershot, or overshot bite; wry mouth; missing teeth (this does not apply to teeth that have been lost or removed by a veterinarian).

      NOSE - The nose is large with wide, open nostrils. The nose may be any color.

      EYES - Eyes are medium size, round and set well apart and low on the skull. All colors are equally acceptable except blue, which is a serious fault. Haw should not be visible.

      Serious Faults: Bulging eyes; both eyes not matched in color; blue eyes.

      EARS - Ears are high set and may be natural or cropped without preference. Prick or flat, wide ears are not desired.

    NECK
      The neck is of moderate length and muscular. There is a slight arch at the crest. The neck widens gradually from where it joins the skull to where it blends into well laid-back shoulders. The skin on the neck is tight and without dewlap.

      Faults: Neck too thin or weak; ewe neck; dewlap.

      Very Serious Fault: A short, thick neck that would interfere with functional ability.

    FOREQUARTERS
      The shoulder blades are long, wide, muscular, and well laid back. The upper arm is roughly equal in length to the shoulder blade and joins it at an apparent right angle.

      The forelegs are strong and muscular. The elbows are set close to the body. Viewed from the front, the forelegs are set moderately wide apart and perpendicular to the ground. The pasterns are short, powerful, straight, and flexible. When viewed in profile, the pasterns are nearly erect.

      Faults: Upright or loaded shoulders; elbows turned outward or tied-in; down at the pasterns; front legs bowed; wrists knuckled over; toeing in or out.

      Very Serious Fault: Legs shorter than half the total height at the withers.

    BODY
      The chest is deep, well filled in, and moderately wide with ample room for heart and lungs, but the chest should never be wider than it is deep. The forechest does not extend much beyond the point of shoulder.The ribs extend well back and are well sprung from the spine, then flattening to form a deep body extending to the elbows. The back is strong and firm. The topline inclines very slightly downward from the withers to a broad, muscular, level back. The loin is short, muscular and slightly arched to the top of the croup, but narrower than the rib cage and with a moderate tuck-up. The croup is slightly sloping downward.

      Very Serious Fault: Overly massive body style that impedes working ability.

    HINDQUARTERS
      The hindquarters are strong, muscular, and moderately broad. The rump is well filled in on each side of the tail and deep from the pelvis to the crotch. The bone, angulation, and musculature of the hindquarters are in balance with the forequarters. The thighs are well developed with thick, easily discerned muscles. Viewed from the side, the hock joint is well bent and the rear pasterns are well let down and perpendicular to the ground. Viewed from the rear, the rear pasterns are straight and parallel to one another.

      Faults: Narrow hindquarters; hindquarters shallow from pelvis to crotch; lack of muscle; straight or over angulated stifle joint; cow hocks; sickle hocks; bowed legs.

    FEET
      The feet are round, proportionate to the size of the dog, well arched, and tight. Pads are hard, tough, and well cushioned. Dewclaws may be removed.

      Fault: Splayed feet.

    TAIL
      The tail is set on as a natural extension of the topline, and tapers to a point. When the dog is relaxed, the tail is carried low and extends approximately to the hock. When the dog is moving, the tail is carried level with the backline. When the dog is excited, the tail may be carried in a raised, upright position (challenge tail), but never curled over the back (gay tail).

      Fault: Long tail (tail tip passes beyond point of hock).

      Serious faults: Gay tail (not to be confused with challenge tail); kinked tail.

      Disqualification: Bobbed tail.

    COAT
      The coat is glossy and smooth, close, and moderately stiff to the touch.

      Faults: Curly, wavy, or sparse coat.

      Disqualification: Long coat.

    COLOR
      Any color, color pattern, or combination of colors is acceptable, except for merle.

      Disqualification: Merle

    HEIGHT AND WEIGHT
      The American Pit Bull Terrier must be both powerful and agile so actual weight and height are less important than the correct proportion of weight to height. Desirable weight for a mature male in good condition is between 35 and 60 pounds. Desirable weight for a mature female in good condition is between 30 and 50 pounds. Dogs over these weights are not to be penalized unless they are disproportionately massive or rangy.

      Very Serious Fault: Excessively large or overly massive dogs.

    GAIT
      The American Pit Bull Terrier moves with a jaunty, confident attitude, conveying the impression that he expects any minute to see something new and exciting. When trotting, the gait is effortless, smooth, powerful, and well coordinated, showing good reach in front and drive behind. When moving, the backline remains level with only a slight flexing to indicate suppleness. Viewed from any position, legs turn neither in nor out, nor do feet cross or interfere with each other. As speed increases, feet tend to converge toward center line of balance.

      Faults: Legs not moving on the same plane; legs over reaching; legs crossing over in front or rear; rear legs moving too close or touching; rolling; pacing; paddling; sidewinding; hackney action; pounding.

    DISQUALIFICATIONS
      Unilateral or bilateral cryptorchid. Viciousness or extreme shyness. Unilateral or bilateral deafness. Long coat. Bobbed tail. Albinism. Merle.

      Note: Although some level of dog aggression is characteristic of this breed, handlers will be expected to comply with UKC policy regarding dog temperament at UKC events.

According To The UKC, This Is The Description Of A Staffordshire Bull Terrier

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STAFFORDSHIRE BULL TERRIER
Terrier Group
View Registration Requirements

Copyright 1992, United Kennel Club, Inc.
Revised April 15, 2007..



History
    The Staffordshire Bull Terrier is a descendant of the Bull and Terrier crosses made in Great Britain in the late 1700's. It was given the name "Staffordshire" in reference to an area where it was very popular, to differentiate it from the other Bull and Terrier breeds.

    The Staffordshire Bull Terrier was recognized by the United Kennel Club in 1975.

General Appearance
    The Staffordshire Bull Terrier is a smooth coated dog that possesses great strength for its size. Although muscular, it is active and agile.

Characteristics
    This breed has indomitable courage, high intelligence and tenacity. Coupled with its affection for its friends, and children in particular, its quietness and trustworthy stability make it an all-purpose dog.

Head
    The head is short and deep throughout with a distinct stop.

    SKULL - The skull is broad and the cheek muscles are very pronounced.

    MUZZLE - the foreface is short, with strong jaws and clean, tight lips.

    TEETH - A full complement of strong, white teeth meet in a scissors bite; the outer side of the lower incisors touching the inner side of the upper incisors.

    Serious Faults: Badly overshot or undershot bites.

    EYES - Dark eyes are preferred, but may bear some relation to coat color. The round, medium size eyes are set on to look straight ahead. Dark eye rims are preferred.

    NOSE - The nose is black.

    EARS - The rose or half-pricked ears are not large.

    Serious Faults: Full drop ear. Full prick ear.

Neck
    The muscular, rather short neck is clean in outline and widens gradually toward the shoulders.

Forequarters
    The shoulders are well laid back.

    FORELEGS - The straight, well-boned forelegs are set rather far apart at the shoulders, but show no looseness at the elbow. The pasterns are strong, and the feet turn out slightly.

Body
    The body is close-coupled with a broad, deep chest and well-sprung ribs. The loins are fairly light and the topline is level.

Hindquarters
    The hindquarters are well-muscled.

    HIND LEGS - The stifles are well-bent. The hocks are well let down. The legs are parallel when viewed from behind. Dewclaws are generally removed from the hind legs.

Feet
    The strong, medium-sized feet are well padded.
Tail
    The medium-length tail is not docked. It is low-set, carried rather low and tapers to a point. It does not curl much, and may be likened to an old-fashioned pump handle.

    Faults: Too long or badly curled tail.

Coat
    The short, smooth coat is close to the skin. Neither the coat nor the whiskers are to be trimmed.

Color
    Acceptable colors include red, fawn, white, black, any shade of brindle, and blue, with or without white.

    Serious Faults: Black and tan or liver.

Height & Weight
    Height, measured at the shoulders, ranges from 14 to 16 inches. Weight ranges are as follows: dogs, 28 to 38 pounds; bitches, 24 to 34 pounds. Weight depends on the height of the individual dog.

Gait
    The free, powerful, agile movement is accomplished with an economy of effort. When viewed from the front or the rear, the legs move parallel. There is a noticeable drive from the hind legs.

Disqualifications
    Unilateral or bilateral cryptorchid. Viciousness or extreme shyness. Albinism

According To The AKC,  This Is The Description Of An American Staffordshire Terrier

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AKC MEET THE BREEDS®: American Staffordshire Terrier Courageous and strong, the American Staffordshire Terrier (Am Staff)’s athletic build and intelligence make him ideally suited to many dog sports such as obedience, agility, tracking and conformation. He is often identified by his stocky body and strong, powerful head. The breed’s short coat can be any color, and either solid colored, parti-colored or patched.

A Look Back
Until the early 19th century, the Bulldog used for bullbaiting in England was more active and longer-legged than the breed as we know it today. It is thought that the cross of this older Bulldog and a game terrier breed created the Staffordshire Terrier. Originally called the Bull-and-Terrier Dog, Half and Half or Pit Dog, it became known as the Staffordshire Bull Terrier in England. When accepted for AKC registration in 1936, the name changed to American Staffordshire Terrier to reflect the heavier American type and to distinguish them as separate breeds.

Right Breed for You?
The Am Staff is a people-oriented dog that thrives when he is made part of the family and given a job to do. Although friendly, this breed is loyal to his family and will protect them from any threat. His short coat is low-maintenance, but regular exercise and training is necessary.

American Staffordshire Terrier Breed Standard Terrier Group General Impression
The American Staffordshire Terrier should give the impression of great strength for his size, a well put-together dog, muscular, but agile and graceful, keenly alive to his surroundings. He should be stocky, not long-legged or racy in outline. His courage is proverbial.

Head
Medium length, deep through, broad skull, very pronounced cheek muscles, distinct stop; and ears are set high. Ears - Cropped or uncropped, the latter preferred. Uncropped ears should be short and held rose or half prick. Full drop to be penalized. Eyes - Dark and round, low down in skull and set far apart. No pink eyelids. Muzzle - Medium length, rounded on upper side to fall away abruptly below eyes. Jaws well defined. Underjaw to be strong and have biting power. Lips close and even, no looseness. Upper teeth to meet tightly outside lower teeth in front. Nose definitely black.

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
Fairly short. Slight sloping from withers to rump with gentle short slope at rump to base of tail. Loins slightly tucked.

Body
Well-sprung ribs, deep in rear. All ribs close together. Forelegs set rather wide apart to permit chest development. Chest deep and broad.

Tail
Short in comparison to size, low set, tapering to a fine point; not curled or held over back. Not docked.

Legs
The front legs should be straight, large or round bones, pastern upright. No semblance 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 must be springy but without roll or pace.

Coat
Short, close, stiff to the touch, and glossy.

Color
Any color, solid, parti, or patched is permissible, but all white, more than 80 per cent white, black and tan, and liver not to be encouraged.

Size
Height and weight should be in proportion. A height of about 18 to 19 inches at shoulders for the male and 17 to 18 inches for the female is to be considered preferable.

Faults
Faults to be penalized are: Dudley nose, light or pink eyes, tail too long or badly carried, undershot or overshot mouths.

Approved June 10, 1936

This Information was taken directly from the AKC and UKC websites. We chose these 3 dogs because they share simularities in description. They are most commonly referred to as "pit bull."