Behavioral experiments have demonstrated color
vision in many animals and several general trends emerge. Old World primates
(great apes, macaque monkeys) have color vision, based upon three different
cone types, very similar to most humans. Mammals, that are not primates, have
only two cone types and their color vision is dichromatic, e.g. they can
discriminate between long and short wavelengths (dogs, cats, horses). One
percent of humans are also dichromatic. —- from here
more info on the page from different scientists.
Color of page makes it hard to read though.