When shopping for a bordersheepdog, be sure to look out for their eyes. Even dogs that look very similar may not be pure border collies.

Dogs with the black genotype should have black and black-based eyes (eg: black with white, multi-tone black, black-red). Dogs with the chocolate genotype should have a dark auburn nose and light brown or amber eyes. Dogs with the blue genotype should have a (slate-like color) dark blue-gray nose and lighter colored eyes. Dogs with the red gene breed can have both the chocolate color genotype and the black genotype. Therefore, some dogs with the red gene will have dark auburn noses and light-colored eyes, while others with the red gene will have black noses and dark brown/brown eyes.

Some standard statements about eye color are often misleading. Of course, the eyes of this dog should be shades of brown, except for the pygmy dog (marble), which will have blue eyes (which doesn't mean whether this applies to one or both eyes) There is no indication that this rule applies to one eye or both eyes). However, since colors have a range of layers. So the statement that black eyes are best applies to any dog is extremely false, and border collies that are not based on black may have light-colored eyes and will not be demeaned in any way for that.

But what is most important to the Mountain Bird-colored dog is the expression of the eyes: docile, alert, alert, intelligent. When a dog looks at you, you should see trust, loyalty, intelligence, and interest, not just eye color. That is, strong or empty expressions can be seen in eyes of any color. (Border collies without the black gene are light-colored eyes, and they will not be demoted for it.) Comments on the mountain bird color (marble flower) dog: Unfortunately, because the (border collie) standard does not have a mountain bird The use of the term chromatic (marble flower) dog has not been adequately explained or carefully considered, resulting in the standard contradicting itself in some places. Some standards allow the pygmy (marble) dog to have either all blue eyes or one brown and one blue, and a coat that can be either solid light or spotted. Some standards allow pink spots on a dog's nose. Most of the standards have detailed descriptions of coat color and pattern. This document (Border Collie Standard) does not currently provide any explanation of the terrier (marble) dog as there are still no terrier (marble) dogs in New South Wales.