What is the difference between a pure border herd and a crossbred border herd

What is the difference between a pure border shepherd and a crossbred border shepherd? The purebred side shepherd’s eyes are more round and very divine, looks very dynamic feeling, if it is a hybrid side shepherd, then its eyes will be more slender, and the eyes will be more melancholy, so in the selection of the side shepherd can watch the eyes, choose a more dynamic cunning some puppies. The purebred border shepherd’s mouth is a little wider, showing a U-shape, while the string border shepherd’s mouth is narrower, showing a V-shape, but it’s not that the longer the mouth is not a border shepherd, as long as its mouth is wide enough to do so. You can also look at the ears to distinguish whether it is purebred, generally more than two months of the border shepherd ears will begin to stand ears, after growing up will naturally drop to the back of the head on both sides, if no ears did not stand up, most of them are due to impure bloodline caused by growing up with larger ears, this is also the best way to determine the purebred border shepherd.