The reason a dog’s eyes glow at night is because there is a lens in the eye that reflects the light source at night. The light we see is not the light emitted by the dog’s eyes, but the light reflected by the lens in the eye. , Dog eyes themselves do not emit light, and the same applies to cat eyes.

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Although dogs have strong night vision, their daytime vision is not as good as that of humans. The main way dogs understand the world is through their sense of smell.