Color cues have proven to be more informative to dogs than glitter.

Color cues have proven to be more informative to dogs than glitter.
The results of early studies on color vision in dogs led to the conclusion that color cues are not important to dogs during their normal activities. However, the canine retina has two types of cones that provide at least the potential for color vision. Recently, experiments controlling for brightness information in visual stimuli have shown that dogs have the ability to perform chromatic discrimination. Here, we show that, for eight previously untrained dogs, color proved to be more informative than brightness when choosing between visual stimuli differing in both brightness and chromaticity. Although brightness could have been used by the dogs in our experiments (unlike in previous studies), it was not.
As in most mammals, the canine retina contains rod photoreceptors responsible for scotopic vision at low light levels and cone photoreceptors responsible for photopic (bright light) vision. Cones produce a smaller fraction of photoreceptors , with higher packing density in the central portion of the retina, where their fraction comprises 20% of all photoreceptors . Cones are represented by two spectral types: cones sensitive to short and long wavelengths with maximum sensitivity of approximately 429 and 555 nm, respectively .
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