This is ectropion (everted lid margin, eyelid rolled outward). See it in droopy dogs (i.e., too much extra skin on face): e.g., bloodhound, Newfoundland, St. Bernard, bull mastiff, great Dane, some spaniels.
Entropion is inverted eyelids, which leads to chronic corneal irritation, pigmentation, scarring, +/- ulceration. Most common inherited eyelid disorder in dogs (and sheep!).
Distichiasis is eyelashes growing from the wrong location (out of the meibomian gland), potentially causing corneal irritation.
Cherry eye is hypertrophy, inflammation, and subsequent prolapse of the gland of the third eyelid (nictitating membrane). Seen most often in young dogs of specific breeds (Cocker spaniel, bulldogs, etc.)
Pannus, also called chronic superficial keratitis, is bilateral immune-mediated infiltration of the cornea by inflammatory cells, blood vessels, and sometimes pigment. Common in some herding breeds: e.g., German shepherds, greyhounds, Siberian huskies.
Image courtesy of Pleple2000.
