What is Dichromatic?
In huumans, dichromatic color vision is a form of colour blindness. Dogs have a dichromatic color vision, which means that they only have two types of cones in their eyes. They match any color they register with no more than two pure spectral lights. Studies performed by Russian scientists demonstrated that dogs tend to discriminate real colour rather than brigthness cues. In other words, dogs discriminate between objects based on their hue.