How to see if small border grazing is pure?

After 4 months, the ears of pure-bred border herders should be 1/4-3/4 semi-vertical or vertical. in addition

If a border collie's ears are still drooping like golden hair after 4 months, then

This border collie is likely to be mixed with other breeds of dogs, so you should be careful.

Correct ears: upright

Second, the mouth

The mouth of a border collie should be wide and short.

It is easy to find that there is an obvious concave bend between the mouth and forehead of the pure-bred border shepherd. Moreover, this cross-border collie looks like a border collie, and its face looks sharp and long, like a triangle.

Third, the tail type

The tail of a purebred border collie should be S-shaped in a natural state (neither excited nor afraid).

The tip of the tail will tilt up. At the same time, the tail is hairy