How tall is she at the shoulder? I don't have the impression from your photos that she's a big dog, and Pyr would produce something like a barge. :D (Otherwise I could see it, but I'm not sure about size.)

Border collies are a varied feast for any dog lover. So many beautiful colours, patters, and morphs. Here is a link to a great site that shows a lot of the variability in the breed. (If you scroll down to the bottom of the page you'll see links to various features such as "ears" and "brindle". I just googled for "split face" and "border collie" because I knew it would bring up that site. Gorgeous dogs, all of them, and you'll see a strong resemblance to Chango in many there.