Heterochromia in cats are not uncommon. In fact, 60 to 70 percent of cats have it. But heterochromia in dogs is uncommon, most dogs with Merle coats have it. About only 3.5 percent of dogs have this. Really any type of dog or cat can get this conditions.
The type of heterochromia MOST cats and dogs have is central heterochromia, sectoral is less common than central. As shown in several pictures below, there are different shades of color in the eyes.
Some animals may even have both sectoral and central. There is a close up picture of a white cat's eyes that are both, sectoral/central (Picture six), a mixture of hypo-pigment and hyper-pigment being the type of eyes (dark/light brown and blues, even a kind of white blue).
The type of heterochromia MOST cats and dogs have is central heterochromia, sectoral is less common than central. As shown in several pictures below, there are different shades of color in the eyes.
Some animals may even have both sectoral and central. There is a close up picture of a white cat's eyes that are both, sectoral/central (Picture six), a mixture of hypo-pigment and hyper-pigment being the type of eyes (dark/light brown and blues, even a kind of white blue).