Siberian Husky is the representative of the breed of northern sled dogs, which is best known in the world. Huskies originally inhabited Siberia (they were bred by the Chukchi people), at the beginning of the 20th century they were brought to North America (to Canada and Alaska). Today, they are the most important sled and sport’s dogs in Canada and the USA, as well as in Europe. Huskies often suffer from heterochromia, which reveals itself by the difference in coloration of the iris or irides of eyes. However, this dysfunction does not cause any problems with the sight.