“Dogs see only in black and white”

It is a widespread belief that dogs experience the world in shades of black and white, but this notion is a persistent misconception. The origin of this myth can be traced back to assertions made by Will Judy, founder of National Dog Week, in his 1937 dog training manual, where he claimed dogs had poor vision and saw only in gray hues. This idea gained further traction in the 1960s when some researchers incorrectly hypothesized that only primates possessed the ability to see color. Early studies on animal vision, limited by the technology of the time, also contributed to the belief that dogs were entirely colorblind.

However, modern scientific research has definitively busted this myth. Dogs have dichromatic vision, meaning their eyes contain two types of cone photoreceptors, the specialized cells responsible for detecting color. In contrast, humans typically have three types of cones, allowing us to see a broader spectrum of colors including red, green, and blue. Dogs can clearly distinguish blue and yellow hues, but they struggle to differentiate between red and green, perceiving these colors as shades of brown or gray. Their vision is akin to a human with red-green color blindness. Behavioral studies, where dogs are trained to identify specific colors for rewards, have provided compelling evidence for their blue-yellow color perception.

People commonly continue to believe this myth because the world dogs see is indeed less vibrant than our own. When a dog looks at a bright red toy in a green grassy field, it might appear as a brownish or yellowish object against a yellowish background, making it less distinct. This limited color perception, combined with the historical prevalence of the myth, makes it easy to assume dogs see no color at all. While their color vision is not as rich as a human's, dogs possess other visual strengths, such as excellent night vision and superior ability to detect motion, traits that were crucial for their ancestors as nocturnal hunters.