Ever wondered how well fido can see at night? Turns out, dogs can see really well in the dark. Their pupils are larger and let in more light, and they have more light-sensitive rods which work better in dim light than color-detecting cones. The retina responds better to less light, and the lens is located closer to the retina, which makes the image on the retina brighter. But, the canines biggest advantege is the tapetum, a mirror-like structure to the rear of the eye that reflects light, giving the retina another chance to register light that has entered the eye. However, this causes dogs vision to be somewhat blurry. This is also what makes a dogs eyes glow in the dark. So dogs need five or six times less light to see than a human does! However your pooch still cant see in total darkness. So there is no reason to leave the light on for your best doggy friend, because he can see just fine.
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