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Q. My dogâs eyes are red. A. Dr. Nunnery: Changes in the color of the eyes can be disconcerting. In fact, itâs one of the most common eye concerns that compel owners to bring dogs to the vet.. My dog has been squinting, as well as rubbing, his eyes. A. Squinting or holding the eye shut usually indicates ocular pain, which can be intense because there are so many sensory nerve endings on the corneaâs surface.
Dogs do in fact see in color, as shown by the fact that a dog's eye contains both rods (which we associate with B/W vision) and cones (which differentiate between colors). While humans' cones are attached to neurons that react to light at 435nm, 545nm and 570nm, a dog's cones react at 429nm and 555nm.