The third eyelid is called a nictitating membrane. It's also called a haw. Regardless of breed, all dogs have three eyelids. The membrane is in the inner corner of the eye, underneath the regular two eyelids we are familiar with. When it's closed, it is drawn horizontally across the eye to the upper, outer part of the eye.. Now that you know more about a dog's eyelids, have you ever considered their eyebrows? See this article on whether dogs do, in fact, have eyebrows. Final Thoughts. Third eyelids are a part of a dog's anatomy we rarely consider. After all, we often think of our dogs as furry humans and assume they just have two eyelids as we do.

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All dogs have three eyelids they have the upper and lower lids like humans do complete with eyelashes and then they have thin inner membranes that are their third eyelid it is set inside the other eyelids sometimes you can see the third eyelid if you look really carefully but most of the time you won't dogs have eyelids for the same reasons.. All dogs, no matter what their breed, will have a third eyelid - unless they have had it surgically removed. When your dog closes their eye, the third eyelid will slide horizontally, covering nearly half of their eyeball. The coloring of your dog's third eyelid depends on their coloring, normally ranging from a greyish cream to translucent.