How many eyelids do dogs have?

The eye has many accessory structures present to ensure that it is protected and clean. These structures include the eyelids, eyelashes, lacrimal (tear) glands, and nictitating membrane. Most animals have three eyelids: the upper lid, lower lid, and nictitating membrane (third eyelid). read more

Finally, it protects the cornea from injury. The human eyelid also protects and nourishes the human cornea, but it performs similar functions with two eyelids as opposed to three. Dogs aren't the only animals with nictitating membranes. Birds, cats, reptiles, fish, and camels also have three eyelids. read more

A dog's third eyelid is the "nictitating membrane" or "haw." This lid is the same in all dogs, regardless of breed or size, although it may have pigmentation variations from breed to breed. Some are clear, while some may be cloudy. read more

Dogs have three eyelids. While you can see the upper and lower lids, the third eyelid only appears when there's issues with the eye. That's when you'll see that reddish or pink membrane emerge and start covering the eye. read more