Is it true that dogs can only see 'black' and 'white' or is it a fallacy?

Dogs see more in the blue-green spectrum, not so much in the red spectrum. They see greens and yellows the best. Light receptors are composed of rods and cones.

Rods allow you to see in the dark; cones allow you to see color. Rods and cones are fixed in size, so you can pack only so many in one eyeball. Dogs have more rods to see better in the dark, but sacrifice cones to make space for those rods.

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