Chihuahua how to see pure or impure pure breed Chihuahua dog selection method

How can I tell if a Chihuahua is pure or not? Want a purebred Chihuahua, but how to choose? The following small beans for you to share purebred Chihuahua dog selection method.　　The purebred Chihuahua dog selection method: check the appearance of 1. spirit: lively, flexible reaction, bright eyes, walking normal, no limp phenomenon. 2. coat: lustrous, natural color, full of pigment, no hair loss phenomenon. 3. fat and thin: try to choose a fat puppy, placed in the palm of the hand with a heavy and strong feeling. The eyes: both eyes are bright, no eye droppings, no tears, the cornea is clear and bright, not cloudy, both eyeballs are the same color. 2. ears: no hair loss, skin flakes and ulcers in the ears, no dirt or odor in the ear canal. 3. nose: slightly moist nose, no snot, cold nose mirror. 4. mouth: the upper and lower lips are well closed, the oral mucosa is pink, no odor, no salivation, white teeth, corner of the mouth is Head: no enlarged lymph glands in the lower forehead, no coughing when stroking the trachea. 6. Back: flat and straight. 7. Long-haired species: long, fringed, naturally hanging, no rash and sparse hair loss, no self-biting tail. 11. limbs: straight limbs, no X- or O-shaped legs. 12. skin: ruddy, no rash, no wound scabs. 13. excrement: stools in strips, brownish in color, no parasites in them, clear urine, not cloudy.