Is Dog Color Blind?

Retina of the eye has 2 types of the photoreceptors called rod cells and cone cells. Rod cells help to see in dim light while cone cells contain pigments which identify colors of different wave length. Humans have 3 types of cones while dogs have 2. Color vision of the dogs is similar to human red-green colorblidness. This type of color blindness in dogs is called deuteranopia.