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Dogs are very intelligent and can be trained in many ways to do many things. If a situation is set up where you attempt to train a dog to do a certain thing when a light comes on, the dog will learn that easily. If you attempt to train the dog to do the thing only when the light comes on in a certain color, when all other things like brightness and color saturation are the same, the dog will not always be able to respond to the color you are trying to train it to. We make the assumption from this that the otherwise intelligent and trainable dog is not able to perceive some colors. The anatomy of dog's eyes is also an important source of information. Color blindness is complicated in humans and in animals. Dogs can perceive some color, but are very much like people who are 'red-green' color blind.

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Q: How do we know dogs are colorblind?
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