This is because, while the retinas of dogs and cats are like ours, in that they contain two types of light-receptors called rods and cones, in the human eye there are more types of cones, which are the ones responsible for colour vision.
But cats and dogs have more rods, the receptors responsible for seeing in the dark. This means that our pets have poorer colour vision than us, but superior night vision, and are also much better at tracking movement."
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