The "B" series gene
has some effect on the color of the nose, eye rims, lips, as well
as the iris (color) of the eye. The "B" series only effects the eumelanin pigment.
The eye color for the black dog ranges from yellowish to dark brown.
"B/B" or "B/b" allows the production of black pigment, whereas "b/b"
produces brown pigment wherever the dog would otherwise have produced
black. The eye color of the brown dog ranges from greenish to amber to
orange to brown.
A dog that is brown (chocolate) will have the genotype of "b/b D/D" or
"b/b D/d" and will have a brown (chocolate) nose (because the "B" gene
is not present and the
"D" gene is in the dominant form).
If the "D" gene is in
the recessive form ("d"), along with "b/b", then the nose would
be a rosey-gray color --- like that of a lilac colored dog.
The "D", or dilution series gene, also has some effect on the color of
the nose, eye
rims, lips, as well as the iris of the eye. Eye color can range from
very pale to light brown.
"D" is dominant and
allows full pigmentation, whereas "d" is recessive and dilutes
the pigment. The "D" series, in the homozygous recessive form ("d")
eumelanin and phaeomelanin, (in theory) by causing the clumping of the
granules in the hair. A dog that is dilute - black ( blue or slate )
will have the genotype of "B/B d/d" or "B/b d/d" and will have a gray
nose (because the "B" gene, which would normally cause the nose to be
black, is now diluted to gray).
Depending on what is
at the B and D Locus on the ee red colored dog, the eyes
can range from very pale to brown. If the ee red colored dog is brown
(which is masked by the ee red color) the nose color will be brown. If
the ee red colored dog is black (which is masked by the ee red color),
the nose will be black.
eye and nose information includes merle. Merles may be any color so the
nose, lips and eye pigment will match what color they are. The first row
shows black merles. These are commonly known as blue merle which isn't
correct. The darkest color on the dog, plus the nose, lips and eye
pigment color should indicate the true color of a merle pattern. Merles
frequently have areas on their nose that are pink instead of colored.
The eyes can be sky blue, also known as china eyes. Sky blue eyes are
just another color and they aren't blind as some believe. Merle eyes may
me marbled, ( slices, spots, 3/4 to 1/4 area ), or several colors. Again
they have normal eyes. A border collie can be affected with several eye
diseases no matter what color their eyes happen to be. It is important
to get your dogs eyes CERF certified and DNA for CEA before breeding
The dogs shown below
are all brown or chocolate merles because they have brown or liver nose,
lip and eye pigment. These are incorrectly, but commonly referred to as
dogs shown below are
slate merle as their nose color is dark gray, as is their eye rims and
lips. There isn't any black on them only shades of blue or slate.
need of additional face shots of slate merles
The higher amounts of
white on the head of a border collie can be troublesome, especially if
both eyes are sky blue without color over their ears. In the pictures
below, the puppy was totally deaf. Both eyes sky blue, no eye rim
pigment, no nose pigment either. The pup is a black & white, but it can
happen with any color.
The dogs below, have
brown eye color, both eyes are pigmented and their noses have good full
pigment. Both have normal hearing even though there is high amounts of
white on their face and head. The dog on the right has normal hearing,
again notice the full pigment and brown eyes. Any dog can be totally
deaf or deaf in one ear. If you want to be sure if your breeding stock
has normal hearing abilities, you can get the BAER hearing test done on