How to Tell If a Border Collie Is Purebred?

Owners can tell a Border Collie’s purity as follows: first, a purebred has oval eyes with moderate spacing, mostly brown (merles are usually blue, possibly with special-colored patches around the eyes). Second, the ears are semi-erect with a small triangular drop.

In addition, the purebred muzzle is relatively wide and U-shaped. Finally, adult males stand 48-53 cm at the shoulder and females 46-51 cm.