How to see the ancient shepherd dog pure or impure

How to see the purity of the ancient shepherd dog see the purity of the ancient shepherd dog, usually adult ancient shepherd dog shoulder height to be between 56 ~ 61 cm, and its body length, and its shoulder height is about the same, looks like a square. The coat of the Old Shepherd is very long, especially the hair on its head will cover its eyes, while its coat is hard to touch, and the hair is not very straight, but not in a curly form, and usually its undercoat has a certain waterproof ability. The nose of the ancient shepherd dog is relatively large and moderate in width, and its teeth are also very strong and generally neatly grown, in the bite state, very tightly pincer and clipped, and the body is very muscular.