Why can dogs only see black and white?
I believe this is a myth, caused by early, not very sophisticated studies. As far
as I know (I used to study color vision in fish) dogs can see color. But apparently
color is not nearly as important to them as it is to us. It may be that for
terrestrial carnivores, its more important to have good acuity (the ability to detect
detail) than to see color. But for herbivores it may be more important to be able
to see color (e.g., for telling if a fruit is ripe).
P.S. this same holds true for cats, too.
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Update: June 2012