Red Eyeball Dog. Conjunctivitis, keratitis, uveitis and cherry eye. Dry eye (keratoconjunctivitis sicca ):
Dry eye (keratoconjunctivitis sicca ): Red eyes occur when there are internal or external inflammations on the eyes, which causes a large amount of blood flow. There are many different causes of red eyes in dogs and can be as simple as allergies, or more serious such as glaucoma.