Did you know all dogs have a 3rd eyelid?
You have two eyelids per eye and I have two eyelids per eye - an upper eyelid and a lower eyelid. Your dog, like all dogs, has three eyelids per eye. You may not have known this because normally we don’t observe these eyelids in action. This third eyelid is called the nictitating membrane; it’s also called a haw. It’s found in birds, reptiles and some other mammals (e.g., camels) too.
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