Seeing your dog asleep with partially open eyes can be surprising, especially if it’s the first time you’ve noticed it. In most cases, it’s completely normal and nothing to worry about. Dogs experience different sleep stages just like people, and their eyelids don’t always stay fully closed.
Here’s why it happens and when it may be worth speaking with your veterinarian.
If your dog also sleeps much more than usual, you may also enjoy reading Why Does My Dog Sleep So Much? What’s Normal and What’s Not?
1. They’re in a Light Sleep
Dogs often nap throughout the day instead of sleeping deeply for long periods.
During light sleep, their eyelids may remain slightly open while they stay aware of what’s happening around them. This allows them to wake quickly if they hear a noise or sense movement.
2. They’re Dreaming
Just like humans, dogs enter REM (Rapid Eye Movement) sleep.
During this stage, you may notice twitching paws, moving whiskers, quiet barking, or eyes moving beneath partially open eyelids. These are all normal signs of dreaming.
Some dogs may also twitch, bark, or suddenly start moving during sleep. You can learn more in Why Does My Dog Get the Zoomies?
3. Their Third Eyelid Is Visible
Dogs have a protective membrane called the third eyelid, or nictitating membrane.
When your dog sleeps, this membrane may partially cover the eye, making it appear as though the eyes are open even though your dog is resting normally.
4. Breed Differences
Some breeds naturally sleep with their eyes slightly open more often than others.
Flat-faced breeds like Pugs, Bulldogs, and Shih Tzus may not fully close their eyelids because of their facial structure.
5. It Could Be a Medical Problem
Occasionally, sleeping with open eyes may be linked to an underlying issue, such as facial nerve damage, an eye injury, or a condition that prevents the eyelids from closing completely.
If your dog also has redness, discharge, excessive blinking, or seems uncomfortable, it’s best to schedule a veterinary examination.
When Should You Be Concerned?
Contact your veterinarian if your dog:
- cannot fully close one or both eyes while awake
- has red or irritated eyes
- develops eye discharge
- frequently rubs their face
- seems painful or unusually tired
How to Help Your Dog Sleep Comfortably
Most dogs don’t need any treatment.
Provide a quiet sleeping area, a comfortable bed, and regular veterinary checkups to help keep your dog’s eyes and overall health in good condition.
Curious about other unusual dog behaviors? Read Why Does My Dog Circle Before Lying Down?
Final Thoughts
Sleeping with partially open eyes is usually a perfectly normal part of how dogs sleep. In most cases, it’s simply a sign that your dog is in a light sleep or dreaming.
However, if you notice changes in your dog’s eyes or signs of discomfort, it’s always safest to have them checked by your veterinarian.
