why do people think dogs are color blind?

The misconception that dogs are color-blind is partly due to a misunderstanding of dog vision and the limited range of colors they can perceive. Dogs do not see the world in the same way humans do, primarily because they have a different range of photoreceptor cells in their eyes.
Humans have three types of cones in their eyes, which allow them to perceive a wide spectrum of colors, especially red, green, and blue. Dogs, on the other hand, typically have two types of cones, which means they are dichromats. They can perceive blue and yellowish-green, but they have difficulty distinguishing between red and green. This is why some dogs may have difficulty differentiating between these colors, especially when they are associated with similar shades of gray.
However, dogs are not color-blind in the strictest sense. They can see color; it’s just that their color vision is more limited than humans’. The idea that dogs are color-blind comes from the fact that they cannot see the full range of colors that humans can, particularly the reddish-orange spectrum. This can sometimes lead to the appearance of color blindness, especially when colors are not easily distinguishable from one another.
It’s also worth noting that some dog breeds have more sensitive eyes and can be more affected by bright light, which can cause them to squint or avoid bright areas. This can give the impression that they cannot see colors well in bright light, but it’s not directly related to their color vision capabilities.
In summary, while dogs are not truly color-blind, their color vision is more limited than human color vision, and this can sometimes lead to confusion about their ability to perceive colors.

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