I don't know if they recognize cars by sight, or not. I know that they rely on their noses and hearing quite heavily, so have never been sure about cars by sight.
When it looks like a dog recognizes a car, or anything else, by sight, I ask myself if they might not be picking up it's scent, or going by the sound. I just don't have an answer to that one. Someone needs to do a study on it.
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