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Heterochromia in Pets

ppppI've gotten quite a few questions about Fenrir's eyes lately!  While I'm always happy to answer questions via email, I figured I'd post here too, for anyone who might be a bit curios, but not enough so to ask.

uuuuuuuuFen has two different colored eyes.  One is a beautiful light/ice blue, and the other is very very dark brown.  His darker eye is so dark that it looks almost black in some lighting, and you can't always distinguish his pupil from his iris.

The question that I seem to be getting most often is whether or not Fenrir can see normally.  He can!  Both of his eyes are healthy and he can see just as well as any other dog can.

Eyes can be two different colors for a number of reasons.  Sometimes it can be caused by an injury or defect in the eye.  In Fenrir's case, it's just a case of genetics.  Dogs born with two different colored eyes are often referred to as being bi-eyed.  Scientifically, it's called heterochromia iridum.

Fenrir has what's called complete heterochromia, which means that his eyes are two complete different colors.  There are other forms of heterochromia where only parts of the eye differ in color.


Heterochromia is more common in certain breeds of dogs, notably Siberian Huskies, Australian Shepherds, and Catahoula Leopard Dogs.  Although it's more common in certain breeds, it's not a trait exclusive to those breeds.

Heterochromia, although rare, also occurs in other animal species - humans included!

I love Fenrir's eyes.  They are one of the first things that drew me to him when I saw him for the first time.  We have gotten some negative comments about them but, in general, people seem to react positively.  Not that it matters what other people think.  What matters most to me is that Fenrir is a happy, healthy puppy!


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