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Dogs have a third eyelid called a nictitating membrane (or third eyelid). It is a thin, translucent membrane that moves horizontally across the eye from the inner corner. The nictitating membrane is responsible for keeping the eye lubricated and protected when the dog is sleeping or blinking. It also helps to remove dust and debris from the eye. In humans, the nictitating membrane is vestigial and only covers a small part of the eye. However, in dogs and other animals, it is much more developed and can cover the entire eye. The nictitating membrane is controlled by a muscle that is innervated by the sympathetic nervous system. This means that it is activated when the dog is relaxed or sleeping. When the dog is awake and alert, the nictitating membrane is retracted. The nictitating membrane is an important part of the dog's eye anatomy and helps to keep the eye healthy and protected.
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