How to see the purity of Whitby

How can I tell if a Whippet is pure or not? The adult Whippet should be 48.26-55.88cm in height and 45.72-53.34cm in height at the shoulder, with an error of no more than 1.5 inches; the Whippet should be elegant and well-proportioned in appearance, muscular, strong and powerful, with a streamlined body shape; the Whippet should have a long, sloping head, a long neck, a fat-free throat, a long tail, and a fine tip. The ideal adult Whippet should be between 48.26-55.88cm in shoulder height; the ideal shoulder height for this dog should be between 45.72-53.34cm, with an error of more than 1.5 inches above and below being out of order. The distance from the front chest to the hips is equal to or slightly greater than the shoulder height, with medium bone mass. The Wheaten is a medium-sized visual hound with an elegant and well-proportioned appearance, showing speed, strength and balance, but not roughness. A truly athletic hound that can run the maximum distance with the least amount of movement. Giving the impression of being beautiful and harmonious, muscular, strong and powerful, the profile is extremely elegant and graceful, with a streamlined body shape that is a requirement for speed. Well-proportioned in outline, well-developed muscles and powerful stride are key considerations; all of his conformation is for speed and work, and any exaggeration must be removed. The Whippet has a long, sloping head, fairly wide between the ears, a stop that can barely be detected, and white, strong teeth. A protruding lower jaw bite is out of order. A protruding upper jaw bite is also out of order if the upper jaw protrudes 1/4 inch or more. The neck is long, neat, well-muscled, rounded and arched, with a flab-free throat that gradually widens and blends into the upper scapular. A short, thick neck or sheep’s neck is a deficiency. The back is wide, firm, well muscled and longer than the loin. The dorsal line starts from the horse’s shoulder ridge in a smooth, graceful and natural arch that crosses over the loin to reach the hips; the rounded arch is continuous and unbroken. Collapse behind the scapula, a sunken back, a flat back, and steep or flat hocks are all defects. The tail is long and has a fine tip that extends to the fly joint when it drops between the hind legs. When he is in motion, the tail is held low and slightly curved upward; the tail should not be held higher than the back. The coat of the Whippet is short, dense, smooth, and hard in texture. Any other coat is a disqualification. Old injuries left from work or caused in an accident should not be discriminated against in competition. Color is not important. The Whippet has a low, spreading, smooth moving gait with a fully extended forequarters and a strong hindquarters drive. When viewed from the side, he moves very spaciously; his forelegs reach forward close to the ground producing a long, yet low stride; and his hindquarters produce a strong drive. When he departs or is observed from the rear, the legs are neither bent inward nor turned outward, and the paws neither interlock nor interfere with each other.