why the eyes of dogs glow at night
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In the dark, canine eyes react to exposure to light differently than human eyes because dogs (along with cats and many other animals) possess a light-reflecting surface known as the tapetum lucidum, located between the optic nerve and the retina.
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Their eyes glow because of a layer called the tapetum lucidum just behind the retina. This layer reflects light because that's exactly what it's meant to do.
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