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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.
A dog's eye color is determined by the amount of melanin found in the iris. Brown eyes indicate a high concentration of melanin, while green or blue eyes indicate a lower amount. Dogs with two different colored eyes have differing melanin levels in each eye. Heterochromia, however, can also be centralized. That is, the iris of one eye can be two different colors.