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  • There's nothing abnormal about a dog having a third eyelid because they all have one. The third eyelid even has its own name: the nictitating membrane, or haw. These membranes are the same in different breeds and sizes of dogs, although the pigmentation of the third eyelid may vary from breed to breed.
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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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