Dogs and humans are not just best of friends, both also share the same qualities and even unique traits and one of these is the eye color. There are just unique things that could happen and sometimes it can be treated as unusual ones. Having different eye color is just one of the unusual cases for dogs and humans. In dogs this phenomena is called Heterochromia.
Although it may appear as an abnormality, there are few cases of Heterochromia that indicates illnesses. Dogs’ eye color depends on the level of melanin present in the iris, which is actually the same with humans. A high level of melanin could give a brown eye color or the usual color of dogs’ eyes.
Meanwhile dogs with light blue or green indicates low level of melanin. The levels of melanin on each eye can be different with one another thus there are some dogs who don’t have the same eye color. One eye can be brown and the other one can be blue or green.
Dogs that were born to have different eye colors fall in the congenital case. Heterochromia can actually be passed through generations. If you got a dog having such condition since it was a pup, the most probable reason is that its parents either have the condition or even both of them. However there are also cases when Heterochromia can be acquired. It can happen in an occurrence of a disease such as glaucoma, cataract, or even the failure of the optic nerve to develop.
Heterochromia is much more common on dogs with lighter coat. It can again be explained due to the levels of melanin. The color of the dogs coat is still part of the melanin’s coverage. One of the most common dog breed to have a different eye color is Siberian husky. However it can still occur even to those who don’t have light coat.