You look to your dog’s spot for a quiet dream and realize that one eye is open looking in space at some point somewhere. Or it could just be crack-in eyelids. Maybe it’s the thin white of your dog’s third eyelid. Sometimes it feels as if my dog’s eye is fixed on my face, even while he’s twitching and making funny sounds with his whole body.
It can be unsettling.
So, why does my dog sleep with his eyes open? In many cases, the answer is surprisingly ordinary: Dogs can leave their eyes slightly open as they drift off to sleep or even during specific stages of sleep, while the third eyelid adds to the already visible and slightly disturbing eye, veterinary information suggests this is somewhat common and may occur during lighter stages of sleep or during dream.
The key is to distinguish between an eye that simply looks partially open because the dog is in the midst of normal sleep, and an eye that the dog is actually not able to close (or properly retract the eyelids. An example is if there is ongoing redness in the eye, excessive discharge or pain, squinting or if vision is otherwise impaired. If these symptoms are present then an ophthalmic problem must be considered.
This realization takes much of the mystery out of this bizarre sleepy manifestation.
What a Sleeping Dog’s Eye Is Actually Doing
Dogs don’t transition from awake to being fully “unconscious” as it were. During sleep they transition through several stages including slow-wave sleep (SWS) and rapid eye movement (REM). During REM sleep in dogs brain activity increases and dogs are often seen twitching, having a jerky movement of limbs, altered breathing rates, a number of dog sounds and moving eyes beneath eyelids.
A dog also sometimes has eyes partly open during light sleep and although appears to be in a deep sleep may not be in one; the animal may be very easy to wake-up. This then is how one reason appearance is misleading. A dog does not appear to be deliberately watching you but rather has a slack eyelid which has failed to close.
Also involved is something else known as the third eyelid (or nictitating membrane). This is the eyelid the viewer does not easily recognize toward the inner of the eye; it can move across the surface of the eyeball and acts to protect the eye as well as supplying an element of the tear film to keep it moist. During sleep the dog’s third eyelid becomes more apparent. To its owner it looks as if it’s partly open with the eye seeming to be covered by a pale-looking membrane.
1. Your Dog May Simply Be Lightly Asleep
Your Dog Just Isn’t Deeply Sleeping The simplest explanation – it’s nothing, your dog hasn’t fallen into a proper “deep sleep,” and they might not fully close their eyes if they’re not totally zonked. According to VCA hospitals partially open eyes can be normal, because at times, dogs may not be fully asleep during napping. Your dog might be in a light form of sleep or “active sleep.” take a moment just watch Instead of being concerned and jolting your pet from his rest, he encourages owners to keep an eye on things in the short term. ” if your dog naps with one or both eyes slightly ajar every now and then …
Doesn’t stir and wake normally …
Get up … And acts as he has every day, there usually isn’t cause for concern,” veterinarian marc haché suggests. The context is everything The dog that has always occasionally done it is not a dog whose eyes are stubbornly sticking open for every single time he nods off, experts emphasize.
2. REM Sleep Can Make the Behavior Look Strange
REM sleep is the most commonly observed stage associated with dreaming. Dogs may demonstrate REM stage with movement of their eyes, twitches, “running” of their paws, irregular breathing pattern, vocalizations (growls or whines), or they may produce “yip noises”. They will demonstrate eye movement normally beneath their eyelids, and so occasionally owners will observe flicking or movement of their eyes whilst asleep.
They would appear to be awake whilst sleeping even though they are sleeping very deeply if their eyes are not completely closed and the owners are able to see this movement.
It would be wise to remember that unusual sleep movement does not always equal an seizure. Dreaming dogs will typically twitch and “yip” during sleep but can be awoken to normal behavior. A seizure is another neurological event. If you do not have a seizure, your dog might appear to demonstrate it while sleeping, while awake it would act normally, be unable to be awoken and follow a new neurological pathway.
Short videos of what you suspect to be a seizure can be very valuable to your vet.
3. The Third Eyelid May Be Creating the Illusion
Dogs have a third eyelid in dogs which many owners do not know are there. This nictating membrane is normally tucked inside the inner corner of the eye and may be visible when the dog is relaxed. The membrane can spread from the inner corner of the eye to protect the cornea and add to the tear film.
These often appear as a whitish, greyish or even pinkish film covering some of the eye.
Your dog does not automatically have its eyeball exposed – the third eyelid acts as a useful protective barrier. Seeing a small amount of the membrane when the dog is asleep is very different from an actual dry cornea which is not properly being covered by the other eyelids. It is easiest to distinguish these if you see how much of the nictitating membrane is showing when the dog is fully alert.
4. Some Dogs Have Trouble Fully Closing Their Eyelids
Did you know that there is actually a condition known as ‘lagophthalmos’ – in which the eyelids do not close completely! It’s not just that your dog occasionally sleeps with his eyes partially open for the sheer novelty of it. Some dogs due to their structure are prone to this because their eye shape and eyelid position simply prevents them from closing properly – the short nosed breeds such as Pugs and Bulldogs would fall in this category and may be affected by issues regarding eye or eyelid exposure, which may include issues preventing eyelid closure such as extreme shallow eye orbits, problems with the facial nerve or orbital change, according to Merck’s Veterinary manual.
So why is it important that your dog can close his eyes to protect them?
The cornea requires being kept moisturized and safe, and as such the inability to close his eyes in a normal manner means his eye can be dried out and cause damage to his corneal tissue. Thus it would be very well advised that if you notice your dog seems incapable of closing his eyes and your animal does not appear to be uncomfortable then you need to take him to the vets.
5. Facial Nerve Problems Can Affect Blinking
This action to close the eye, though considered voluntarily, also involves our nerve-muscle mechanism the lids to close the eye. If an injury affects the facial nerve, then normal eye-opening or closing will fail. A disorder within the nervous system may even result in the altering of the appearance of the eye.
Such as Horner’s syndrome which creates altered features that a patient can have that are; the smaller pupil of the eye, drooping eye lid, and a shriveled-up appearance and rise of the third eyelid.
Symptoms and signs may show rapidly and may take many things for the causes of any disorder. All this is just to suggest a problem; an eye appearing differ and on that particular time such as, in your pets sleeping eyes can still be something concerning. So do not easily pass-away, or overlook it as a habit; time to realize it for once does show any useful signs, did the eye looking and appearance had this symptoms ever and for what period did that already had appeared?
6. Eye Irritation Can Change How Your Dog Holds the Eyelids
Blink, rub, partially close; you can also expect your dog’s eyelids to be in an unusual position even if, humorously, you only notice this abnormal placement of eyelids during sleep only after other dog symptoms of eye disease appear. Foreign material in the eye; allergies; conjunctivitis; abnormalities in your dog’s eyelids or cornea and other disorders can trigger redness, swelling, secretions (such as green, white or yelloweye boogers), discomfort and tearing (such as watery eyes with the same cause of conjunctivitis). Merck’s Manual advises eye disorders that involve the conjuntivast have variety of possible origins and look at their cause with just their appearance.
When your dog is awake take note of her/his eyeballs:.
Healthy eyeballs would normally appear clear and feel fine, not red, with chronic swelling, inflammation, cloudiness or strange matter secreted from them. TheAmerican Kennel Club’s guidelines: look closely for signs of Inflammation , presence of Abnormal eye fluid , and for other changes to your dog’s eyes.
7. Short-Faced Breeds Deserve Extra Attention
Breed Anatomy Can alter the interpretation of seemingly innocent behaviors. Dogs with the bulge over their eyeballs and relatively shallow eye cups may not as well equipped with the ability to shield their cornea with the eyelids. This is only part of the justification for how prone Brachycephalic breeds appear susceptible to exposure-related eye conditions.
If any particular dog of one of these breeds sleeps with their eye(s) open owners need a bit more notice for;whether it opens again completely once asleep;whether it looks dried;irritated;red;squinted and it was leaking.
Although one sleep posture appears amusing in a particular dog;another breeds one of the more peculiar and warrants further evaluation.
8. A Visible Third Eyelid Is Not Always the Same Thing as a Sleeping Eye
One last point of confusion comes from the idea of a transient versus chronic problem with the third eyelid.
A transient showing of the third eyelid during sleep is not necessarily pathological.
However, if the third eyelid remains visible with the dog’s eyes open, there may be a number of reasons for this altered position such as eye pain, dehydration, an underlying neurologic problem, or disease within the orbital tissue, or problems related to the third eyelid itself.
A round, red swelling in the inner part of the eye may also be an ectropian third eyelid gland or cherry eye, which is when the gland associated with the third eyelid protrudes from its pouch.
This look is quite different from a thin membrane blinking into view as your dog falls asleep.
9. Rarely, Sleep-Like Episodes Can Have a Medical Cause
The majority of dogs that sporadically close their eyes but rest with them slightly ajar are not suffering from an underlying disorder affecting their sleep quality. There can be a distinction, although. Sudden falls to sleep in a way that seem out of context for your dog such as if he falls asleep in the middle of an activity, even though he may not be tired as well as when resting with his lids opened some for instance when he may have a disorder such as Narcolepsy.
Also in the absence of dreaming, if your dog is moving awkwardly, becomes unconscious, or has trouble waking/is very groggy or confused after an awakening episode, don’t brush it off automatically.
Sometimes making a Video from afar safely of this strange behavior could prove immensely useful to differentiate this against neurological and physical conditions.
How to Tell Normal Sleep From an Eye Problem
The more important question is not simply, “Are my dog’s eyes open?” but rather whether anything else about their eyes, sleep, or behavior seems unusual.
Instead, ask what the eyes look like before, during, and after sleep.
| What you observe | More consistent with normal sleep | More concerning |
| Eyes slightly open only while sleeping | Yes | — |
| Dog wakes normally | Yes | — |
| Normal behavior after waking | Yes | — |
| Third eyelid briefly visible during sleep | Often normal | Persistent visibility while awake |
| Redness or swelling | No | Veterinary evaluation |
| Yellow/green or excessive discharge | No | Veterinary evaluation |
| Frequent squinting | No | Veterinary evaluation |
| Pawing or rubbing at the eye | No | Veterinary evaluation |
| Cloudy or unusually blue-looking cornea | No | Prompt veterinary assessment |
| Sudden vision changes | No | Urgent veterinary assessment |
| Eye appears painful or bulging | No | Emergency assessment |
This distinction is supported by veterinary guidance: cloudy eyes, squinting, inability to see, eye discharge, and signs of significant pain are reasons to seek veterinary attention rather than simply monitoring the sleeping habit.
When Should You Call the Veterinarian?
While occasional dog-sleep eye-slippage is unlikely to warrant concern alone. However this dog is more obviously suffering if they are in other difficulties. Your dog should be examined by a vet if their eyes are chronically red and sore, have abnormal discharge, if the animal frequently blinks or paws at them, is it’s third eyelid prominent whenever they are awake, and does it appear unable to close its eyes to achieve “normal sleep”.
Sudden loss of vision or painful eye, cloudy cornea, bulging or prominent eye with significant change in shape and position, severe red eye, acute significant change in the appearance of the eye, these are all veterinary emergencies that pose a threat to vision.
Take a sudden eye change very seriously. Glaucoma, an ophthalmological emergency according to vet sources, may present with eye pain, red eye, cloudiness of the cornea, changes in the pupils and with loss of sight.
What You Can Safely Do at Home
If you decide your dog looks normal, then observation first.
Look at eyes when dog is wide awake.One is being compared with the other.Anything different – relative size of pupil, red “sclera” (the whites of the eye), puffy around the eye, “weepy” (discharging something), hazy looking or changes in color/ position of “third eyelid”.
Then observe the dog when it is sleeping normally.
If this happens only around the house and the eye looked totally normal upon arrival to your veterinary hospital, an iPhone “movie clip” is very useful for presentation of the history.
Do not administer anything into the eye that isn’t prescribed by a veterinarian specifically for THIS eye and THIS dog; including those saved leftover vet medications or “leftovers” for another of your own pets as an antibiotic for a skin problem does NOT treat an ulcer, glaucoma, etc.! Do not give anything that was intended for use in humans; those may be potent and have complications in an animal patient.
If the eye looks painful and the lids seem damaged, do not attempt to pull the lids open or force the eye shut; any movement you make can further damage the eye or surrounding tissues.
Why You Should Not Wake a Dog Just Because Its Eyes Are Open
In general, there is no reason to disturb the dog just because they only have slightly open eyes if the dog is sleeping deeply, is breathing with no apparent struggle, and seems at no risk or discomfort. Dogs experience dream cycles in the same way as human do-this includes eye movement, facial twitching or vocalizations, as well as normal rhythmic sleep breathing which will vary throughout cycles; the REM stage is especially characterized by movement and irregular breathing. Furthermore, dogs who awaken suddenly can be Startled from the sleep during the process.
However the American Kennel Club states that when seeing your dog dreaming sleep cycle for one must make do so in not disturbing our sleeping animals .
If for some reason you wish to ascertain that your animal is okay but is still slumbering, it would advisable and sound idea to address the dog using a mellow voice at a respectable distance rather than directly touching the dog while near its nose.
A Simple Observation That Can Answer a Lot
Your Labrador is sleeping on the couch and you discover after ten minutes that its one eye is still slightly open. The eye is not red or inflamed, there is no discharge, and he is not squinting. When you softly say his name, he wakes up, does a big stretch and takes a drink, and is his usual self.
That is to be expected and is not concerning.
Consider another scenario: Your dog has never slept with his eye open prior to this event. For the past two days, as he has napped, one of his eyes has stayed half-opened. When the dog is awake the eye appears red, he is rapidly blinking and a watery discharge has started.
The fact that the eye is slightly open during sleep is no longer the primary concern; the integrity of the eye itself is.
It’s the outward signs that are important in determining a possible diagnosis.
Common Mistakes Dog Owners Make
A very common mistake is believing an open eye means the dog is awake. Sleep can be deeper than appearance dictates.
Yet another mistake is thinking every visible bit of membrane is an abnormality. A dog’s third eyelid-also known as the nictitating membrane-is normal, particularly visible in some dogs when they relax or are dozing.
Perhaps The Most Dangerouns Mistake; thinking anything strange appearing in my dog’s eye is” just something else dogs do.” Painful red eyes, squinting or unable to open an eye, discharge and watery eyes or clouds in the eye may need a veterinary visit.
Don’t try to determine what the specific reason for the eye symptoms may be by using a photograph! Symptoms can look extremely similar to most humans, yet have vastly different causes, treatments and prognoses! Your veterinarian may perform fluorescein stain testing, tear stimulation tests andtonometry(eye pressure tests).
The Bottom Line
So, why does my dog sleep with his eyes open? Most often, it is because Dogs can partially open their eyelids during canine sleep and their third eyelid may become visible as they relax. Certain other sleep activities, REM is also what makes some sleeping dogs look hyper and aware. The situation can grow larger the if is present and there is eye related trouble. However, while they have other indicators, a partially opening the eyes in there dog at time is nothing.
Just ensure the that it is now is fully exposed, no long or any sign is that their canine.
Just like open mouth dog also look happy by smiling for just some second when the it is at sleep.
Frequently Asked Questions
1. Is it normal for dogs to sleep with their eyes partially open?
Yes. Many dogs may partially open their eyes at times while asleep especially lighter states and may also be prone to “show the third eyelid” which can create the effect of the eye being partially open even though it’s closed tighter than it seems to be.
2. Why can I see a white or pink film over my dog’s eye while he sleeps?
That’s most likely your dog’s “third eyelid” – a membrane that helps moisten and protect the eyeball that typically becomes more evident when he is relaxed and even dozing off. This membrane, which is normal, is called thenictitatingmembrane.
3. Should I wake my dog if his eyes are open while sleeping?
Most often, No – as long as it isn’t causing them obvious pain or other signs of distress, is breathing normally and otherwise in good health, it is perfectly normal for a dog to make a variety of odd movements & eye patterns in REM sleep. When in doubt, you can try to coax them awake using your voice instead of a sudden poking motion at the face 🙂
4. Why does my dog’s eye stay open when he sleeps?
Persistent inability for the eye to be in a closed state (always or frequently opening or attempting to open, but not closed); Inability of eyelid to close fully Incomplete eyelid closure (lagophthalmos) can lead the cornea to dry out, causing a scratch. Any time you notice that the eye not fully close, please have it checked out by your veterinarian.
5. Is sleeping with one eye open a sign of a seizure?
Not always. Dogs sleep with one or both eyes ajar, and can move and even twitch during REM sleep. More suspect events involving possible seizures are marked by lack of responsiveness, significant involuntary movements, or strange behavior after the episode. If you are uncertain, video the episode and call your veterinarian.
6. When is a dog’s open eye during sleep an emergency?
An open eye itself is not usually an emergency. However, the eye requires immediate veterinary attention if accompanied by sudden blindness, pain, proptosis (forward and bulging of the eye), intense redness, pronounced opacity of the cornea, or a similar rapidly progressive condition of the eye. Acute glaucoma or some types of corneal trauma, for instance, can cause loss of sight.
7. Do some dog breeds have more trouble closing their eyes during sleep?
Yes. Dogs that have short wide heads and pronounced eyes are at increased risk of their eyes not fully closing and their corneas being exposed. We should take a closer watch of those flat faced pets for signs of redness, dryness, inflammation, squinting, or any changes with their eyes.
Conclusion
So, why does my dog sleep with his eyes open?In many cases, there is nothing to worry about.Dogs may partially open their eyes during lighter stages of sleep or REM sleep, and the third eyelid can sometimes become visible, making the eyes look more open than they really are. If your dog wakes normally, behaves as usual, and has clear, comfortable-looking eyes, this behavior is often simply part of normal canine sleep.
The ongoing exposure should not be overlooked though. Red eyes, swelling in the eyes and face, discharge, squinting, excessive rubbing of the eyes, cloudy eyes, pain when trying to open or close the eyelid or inability to close the eyelid. The first five would point to something wrong with the eye or something involving your dog’s neurology and your veterinarian should examine her, especially if the condition came about suddenly. It is not the open eye that necessarily points to the problem-it’s what the condition of the eye and your dog’s behavior tell you what is happening.
