"The breed may have "cracked glass" or "marbled glass" eyes (heterochromia) and occurs when both colored and glass portions are present in the same eye. Cracked or marbled eyes are blue or blue-white in color. Catahoulas with two cracked or marble glass eyes are often referred to as having double glass eyes. In some cases, a glass eye will have darker colored sections in it, and vice versa. Cracked eyes may be half of one color and half of another. They may just have a streak or spot of another color. Gray eyes are usually cracked eyes, made of blue and green, giving them their grayish appearance. The eyes may be of the same color or each of a different color. Eye color can also be ice blue, brown, green, gray, or amber. No particular eye color is typical of Catahoulas."