Labrador how to see the pure or impure

How can I tell if a Labrador is pure or not? Labrador parts outline is obvious, well combined, proportionate shape, square, square head, short face, wide mouth, wide hindbrain, clear head lines, cheeks without a lot of meat, clear skull lines, clear outline below the eyes, cheeks do not protrude, head slightly shows the center line; lips can not be square or drooping, forming a curve toward the throat. 1. overall parts outline is obvious, well combined, shape Well-proportioned, square-shaped, square head, short face, wide mouth and wide back brain, moderate stop. The head and the front face are on parallel surfaces with each other, and the lengths are approximately equal. The stop is moderate and the eyebrows protrude slightly, so the head is not a complete straight line to the tip of the nose. The brow bone emphasizes the stop. The head is well defined, the cheeks do not have a lot of flesh, and the bones of the head are well defined, with a distinct outline under the eyes, but the cheeks are not prominent. The head shows a slight center line; the lips cannot be square or drooping. However, a curve is formed toward the throat. 2. Nose Nose mirror is wide and the nostrils are very well developed. Yellow or black dog’s noseglasses are black, chocolate colored dog’s noseglasses are brown, noseglasses fade to light shade is not a defect. Thoroughly pink nosepiece or nosepiece lacking any pigment is a disqualification. 3. ears ears hanging, moderately close to the head, positioned rather back a bit, slightly below the head; slightly above the level where the eyes are. The ears should not be too large and heavy, but in harmony with the proportions of the head, and when pulled forward, extend to the inside of the eyes. 4. Eyes sharp, friendly eyes showing good temperament, intelligent and quick-witted are the characteristics of this breed. The eyes are medium sized and positioned apart, neither protruding nor positioned very deep. Black or yellow dogs have brown eye color and chocolate colored dogs have brown or hazel eye color. Black or yellow eyes make the expression harsh and unwanted. Small eyes, eyes positioned too close together, round and protruding eyes are not typical of the breed. Black or yellow Labrador Retrievers have black eye rings and chocolate Labrador Retrievers have brown eye rings. The lack of pigmentation in the eyes is a disqualification. 5. The amount of bone should be sufficient, look at the size of the paws, the bones are tight, the muscles are explained and developed. The coat of the Labrador Retriever is different. The coat is short, straight and very dense. It also feels very hard when touched when small. Labradors come in black, yellow and chocolate. However, if there is an intermingling of other colors of hair, it is not pure, and a black chest with a handful of white is considered out of order.