Dogs are red-green color blind.

Dogs are red-green color blind, research indicates.Dogs are colourblind and struggle to distinguish between red and green, meaning finding a red ball in the park could prove tricky, scientists have said. Experts have known for some time that dogs have poor vision, and are up to eight times worse than humans at seeing things in detail. But until now, nobody knew why. Now scientists have developed a test for dogs and found that they struggle to tell red and green apart, much like colour blind humans, a condition known as deuteranopia.