Can Dogs identify colours?

Dogs can see better at night, but their eye structure is such that the average dog will have 20/75 vision (they can see at 20 feet what a human can see at 75 feet) -- and they see substantially fewer colors: Dogs and most non-primate mammals have only two kinds of cones. In dogs these cones have peak wavelength sensitivities in the yellow-green and violet range. Dogs can see two basic color groups, red-orange-yellow-green and blue-violet. All the colors within these groups appear the same. But dogs can tell the difference between the two groups and can tell the difference between the two groups and white or gray.