Hanging or lazy lower, or drooping of eyelid is a pet symptom most commonly seen in dogs, seldom in cats. It is mainly caused by aging and fatigue. Some breeds are born with hanging eyelids, such as the St. Bernard, Mastiffs, and Bloodhounds. Sometimes drooping of the eyelids may be a sign of an eye injury, in which a veterinarian should be consulted.
Drooping of Eyelid Affects