All dogs do, in fact, have eyelids. But depending on your dog’s breed, they may not be as pronounced as your own eyelids. Just like in humans, a dog’s eyelids are an extension of the skin. They protect the eyes and keep them healthy.
Dogs have three eyelids while humans only have two functional eyelids.
A dog’s third eyelid—also called the nictitating membrane—is usually hidden, with only a small portion normally visible. If you look closely into your dog’s eyes, you will see a small triangular segment of his third eyelid at the inner corner of his eyes. The third eyelid is typically black, brown, or (rarely) pink.
Due to the blink reflex, if an object comes near a dog’s eyes, his eyelids will close and prevent the eye from trauma. Eyelids also help to keep dogs’ eyes moist with tears. Every time your dog blinks, the eyelids stimulate more tears to come out and old tears to drain away. A dog’s third eyelid is also responsible for producing tears. Tears contain liquid to keep the eyes lubricated, but they also contain important proteins called immunoglobulins which are part of the immune system’s defense in protecting the eyes from infections.
Credit : Great Pet Care
Picture Credit : Google
