"Cherry eye" is a common term for prolapse of the third eyelid gland. dogs, have an "extra" or third eyelid located inside the lower eyelid, also referred to as the “nictitating membrane.” The third eyelid serves as an additional protective layer for the eye. The third eyelid also contains a special gland that produces a significant portion of the eye’s protective tear film. When this gland prolapses, the condition is known as "cherry eye".
What can we do about this condition?
It has not been proven that this condition is inherited, but according to the Canine inherited Disorders Database, Bloodhounds are predisposed. Breeders need to consult with an eye specialist to evaluate whether their individual case is due to poor eyelid construction, or other factors before deciding to breed.