According to the rules, a National Greyhound Association Greyhound isn't allowed to show and an American Kennel Club Greyhound cannot race.
There are subtle variations between the two. The apparent difference is that the National Greyhound Association Greyhound is much more muscular. Listed below are the characteristics and how each one is judged and given points. This information has been referenced from the AKC website.
Long and narrow, reasonably wide between the ears, barely perceivable stop, little or no development of nasal sinuses, excellent length of muzzle, which should be powerful without coarseness. Strong and even front Teeth.
Small and slender in form, set back and folded, except when excited, when they are semi-pricked
Dark, bright, deep, intimating essence.
Muscular, long, without throatiness, slightly curved, and widening progressively into the shoulder.
Placed as diagonally as possible, strong without being loaded.
Perfectly straight, set well into the shoulders, neither turned in nor out, with strong pasterns.
Deep, and as wide as harmonious with speed, reasonably well-sprung ribs.
Broad and muscular.
Good depth of muscle, well-formed, well cut up in the thighs.
Powerful, long, and muscular, broad and properly set down, well-bent stifles. Hocks well bent and fairly close to the ground, wide but straight fore and aft.
Close and hard they seem more like a hare than cat feet, well knuckled up with good strong claws.
Large, slender and narrow with a slight upward curve.
Small, sleek and firm in texture.
Immaterial.
Dogs, 65 - 70 pounds; bitches 60- 65 pounds.
General symmetry and quality 10
Head and neck 20
Shoulders and chest 20
Back10
Quarters 20
Legs and feet 20
Total 100
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