An odd-eyed cat is a cat with one blue eye and one green, yellow, or brown eye. This is a feline form of complete heterochromia, a condition also present in humans and some other animals (including horses and huskies). It can occur in a cat of any fur color, provided that it possesses the white spotting gene. Animals affected by the condition can have partial heterochromia, in which only part of the iris is a different color.Photo: Keith Kissel