The world in the eyes of dogs is not black and white. Research shows that dogs also have colors in their eyes, but they are just different from humans. Dogs' eyes cannot distinguish between green and red, similar to red-green color blindness in humans. It is good that dogs can distinguish fewer colors than humans, but it is not that they cannot distinguish colors. They just lack cones and cannot capture too many colors. At night, dogs’ vision is three to four times better than that of humans, and dogs’ eyes are highly sensitive to light and can accept strong light stimulation.