Dog Winking: Why Dogs Wink and What It Really Means
Why does your dog wink at you? Learn the canine science behind the dogwink — from benign facial signals to the eye health conditions that can mimic winking.
So, What Is a "Dogwink" — and Why Does Your Dog Do It?
A dogwink is when your dog deliberately closes one eye while keeping the other open, often during eye contact with you. In most healthy dogs, a single, slow, deliberate wink is a normal appeasement or affiliative signal — part of the canine "soft eyes" communication toolkit that signals relaxation, trust, and social bonding. However, repetitive, involuntary, or one-sided eye closure can also indicate a medical issue such as entropion, corneal ulcers, dry eye (KCS), or neurological conditions like facial nerve paralysis. If your dog's winking is new, frequent, accompanied by discharge, squinting, pawing at the eye, or head tilting, consult your veterinarian promptly.
The Science Behind the Dogwink: What Research Tells Us
Canine facial communication has received growing scientific attention over the past decade. A landmark 2019 study published in Scientific Reports by Kaminski et al. found that dogs produce significantly more facial movements — particularly inner eyebrow raises (AU101) and eye narrowing — when a human is paying attention to them versus when they are alone or with another dog. This suggests that certain eye-related facial expressions in dogs are not random but are audience-dependent social signals shaped by domestication.
The dogwink fits into this framework. While full bilateral eye-closure (a "long blink") is well-documented as a calming signal in canine body language — described extensively by Norwegian dog behaviorist Turid Rugaas — the unilateral wink appears to be a variation that serves a similar affiliative function. Dogs who wink at their owners are often simultaneously displaying other relaxed body language: soft ears, loose tail wagging, and a slightly open mouth.
Research from the University of Portsmouth's Dog Cognition Centre has further demonstrated that dogs' facial expressions are more complex and intentional than previously believed. Dogs produce an average of 27 distinct facial movements when interacting with humans, compared to far fewer when alone — evidence that winking and other eye signals may be part of a deliberate communication repertoire.
Evolutionary Origins: From Wolf Pack Signals to Living-Room Winks
Ancestral roots: In wolf social behavior, direct sustained eye contact is often perceived as a challenge or threat. Wolves use averted gazes, slow blinks, and half-closed eyes as appeasement signals to defuse tension within the pack hierarchy. These "soft eyes" communicate non-aggression and submission to higher-ranking individuals.
Domestication shift: Over approximately 15,000–30,000 years of co-evolution with humans, dogs retained and amplified many of these calming signals — but redirected them toward their human caregivers. What began as a deference signal within wolf hierarchies became a cross-species bonding behavior. A dog who winks at you is, in evolutionary terms, telling you: "I trust you, I am not a threat, and I feel safe."
Neoteny factor: Dogs exhibit neoteny — the retention of juvenile traits into adulthood. Puppy wolves use exaggerated appeasement signals toward adult pack members; adult dogs continue using these signals toward humans throughout their lives. The dogwink is one such neotenous behavior that persists because it has been positively reinforced across generations of domestication.
The Physiological Mechanism: How Dogs Produce a Wink
Understanding the mechanics of a dogwink requires looking at canine facial anatomy and neurology:
- Orbicularis oculi muscle: This circular muscle surrounds each eye and is responsible for eyelid closure. Dogs can contract this muscle unilaterally (one side at a time), which enables the single-eye wink.
- Facial nerve (Cranial Nerve VII): This nerve controls most facial muscle movement, including eyelid closure. It branches independently to each side of the face, which is why one-sided winking is physically possible.
- Nictitating membrane (third eyelid): Dogs have a third eyelid that moves diagonally across the eye for protection and moisture distribution. Sometimes what appears to be a "wink" is actually the third eyelid briefly sweeping across the eye — a normal lubrication mechanism, not a social signal.
- Voluntary vs. involuntary control: A true social wink is a brief, deliberate closure lasting roughly 0.3–1 second, usually accompanied by relaxed body posture. Involuntary eye closure — caused by pain, irritation, or nerve dysfunction — tends to be slower, sustained, or accompanied by squinting (blepharospasm).
Breed Variations: Which Dogs Wink More (and Why)
Not all dogs wink with equal frequency or ease. Several breed-related factors influence this behavior:
| Breed Category | Winking Tendency | Key Factors |
|---|---|---|
| Brachycephalic breeds (Pugs, French Bulldogs, Shih Tzus) | High visible "winking" — but often medical | Shallow orbits and prominent eyes (exophthalmos) make incomplete eyelid closure common; what looks like a wink may be lagophthalmos or corneal irritation |
| Herding breeds (Border Collies, Australian Shepherds) | Moderate to high social winking | Highly attuned to human eye contact and facial cues; bred for responsive handler communication |
| Companion/Toy breeds (Cavalier King Charles Spaniels, Havanese) | Moderate social winking | Bred specifically for human bonding; strong affiliative signal repertoires |
| Sight hounds (Greyhounds, Whippets) | Lower frequency | Dolichocephalic skull shape with deep-set eyes; less facial musculature range for exaggerated expressions |
| Spitz breeds (Siberian Huskies, Akitas) | Variable — often one-eye squint | Independent temperament; may squint one eye in bright light rather than produce social winks |
Important note for brachycephalic owners: If your Pug or Frenchie appears to "wink" frequently, have their eyes examined by a veterinarian. Brachycephalic breeds are predisposed to exposure keratopathy (corneal damage from incomplete eyelid closure), entropion (inward-rolling eyelids), and pigmentary keratitis. According to the Merck Veterinary Manual, early detection of these conditions prevents permanent vision loss.
When a Dogwink Signals a Problem: Medical Red Flags
See your veterinarian if your dog's winking is accompanied by any of the following:
- Persistent squinting or holding one eye closed for more than a few seconds at a time
- Redness, swelling, or visible discharge (yellow, green, or bloody) from the eye
- Pawing at or rubbing the affected eye against furniture
- Cloudiness, bluish haze, or visible change in eye color
- Head tilting, facial drooping on one side, or difficulty eating/drinking
- Sudden onset of frequent "winking" in a dog that never did it before
- Visible third eyelid protrusion that doesn't retract within seconds
Several medical conditions can masquerade as a harmless dogwink:
- Corneal ulcer: A scratch or erosion on the eye surface causes pain and reflexive squinting. Common in active dogs and brachycephalic breeds. Diagnosis requires fluorescein staining ($45–$120 at a general practice vet).
- Dry eye (Keratoconjunctivitis Sicca / KCS): Inadequate tear production leads to irritation and frequent blinking/winking. The Schirmer tear test ($30–$60) confirms diagnosis. Lifelong medication with cyclosporine or tacrolimus ophthalmic drops ($25–$60/month) is typical treatment.
- Entropion: The eyelid rolls inward, causing eyelashes to scrape the cornea. Surgical correction costs $300–$800 per eye and is common in Bulldogs, Shar-Peis, and Retrievers.
- Facial nerve paralysis: Damage to Cranial Nerve VII causes inability to close one eye, drooping lip on the affected side, and ear droop. Can result from ear infections, trauma, or idiopathic causes. The AVMA recommends prompt neurological evaluation.
- Horner's syndrome: A neurological condition causing a constricted pupil, drooping upper eyelid, sunken eye, and elevated third eyelid on one side. Often looks like a persistent half-wink.
Myth vs. Fact: Common Dogwink Misconceptions
| Myth | Scientific Fact |
|---|---|
| "My dog winks to show love — just like humans do" | Dogs don't wink because they learned it from humans. The behavior has roots in ancestral appeasement signals, though it may be reinforced by owner reactions (operant conditioning). |
| "Dogs wink when they're being sneaky or guilty" | Dogs do not experience guilt as humans do. The "guilty look" — including squinting — is actually a stress-based appeasement response to owner body language, not admission of wrongdoing (Horowitz, 2009, Behavioural Processes). |
| "If my dog winks, it means they have perfect eye health" | Frequent unilateral eye closure is more often a sign of irritation or discomfort than a sign of health. Occasional, brief social winks are normal; persistent ones warrant examination. |
| "All dogs can wink on command" | Winking on cue is a trained trick that requires shaping through positive reinforcement. Not all dogs will offer the behavior naturally, and forcing eye manipulation can cause stress. |
| "A wink means my dog is flirting with me" | Anthropomorphic interpretations like "flirting" misread canine communication. Dogs use eye signals for social cohesion and appeasement, not romantic expression. |
How the Dogwink Differs From Human Winking
Humans and dogs both close one eye, but the underlying mechanisms and meanings diverge significantly:
- Intentionality: Human winking is typically a conscious, culturally learned gesture with specific social meanings (humor, secrecy, flirtation). Dog winking is a semi-voluntary behavior rooted in body language communication — more akin to a human smile or relaxed eyebrow raise than a deliberate wink.
- Facial musculature: Humans have approximately 43 facial muscles with fine-grained voluntary control. Dogs have fewer facial muscles but have evolved specific muscles — like the levator anguli oculi medialis (inner eyebrow raiser) — that are more developed in dogs than in wolves, specifically for human-directed communication.
- Visual processing: Dogs see the world with dichromatic vision (blue and yellow wavelengths) and have lower visual acuity (approximately 20/75 compared to human 20/20). This means your dog's wink is less about visual precision and more about gross motor signaling — they don't need you to see a "perfect" wink, just the general gesture.
- Emotional association: A human wink can carry irony or deception. A dog's eye-closing signal, by contrast, is almost always an honest indicator of their emotional state — either relaxation (social wink) or discomfort (medical squint).
Practical Takeaways: What the Dogwink Means for Your Daily Life
1. Read the full body, not just the eye. A wink paired with a relaxed, wagging body and soft ears is a positive social signal. A wink paired with a tense body, tucked tail, lip licking, or whale eye (showing the whites of the eyes) indicates stress — your dog is using an appeasement signal because they feel uncomfortable.
2. Don't punish winking. If your dog winks at you during a training session or when you approach their food bowl, they are communicating non-aggression. Punishing appeasement signals damages trust and can escalate anxiety-based behaviors. Instead, use positive reinforcement to build confidence.
3. Monitor for changes. Keep a baseline understanding of your dog's normal facial habits. If a dog who never winked suddenly starts closing one eye frequently — especially a dog over age 7 — schedule a veterinary ophthalmic exam. Age-related conditions like nuclear sclerosis, cataracts, and uveitis can alter eye behavior.
4. You can train a "wink" cue — safely. If you want to teach your dog to wink on command, capture the behavior when it happens naturally: the moment your dog closes one eye, mark it with a clicker or "yes!" and reward with a treat. Gradually add a verbal cue ("wink!") or hand signal. Sessions should be under 5 minutes. Never physically manipulate your dog's eyelids.
5. Brachycephalic breeds need proactive eye care. Budget $200–$400 annually for routine ophthalmic care if you own a Pug, Bulldog, or Shih Tzu. Daily eye lubrication with a veterinary-approved artificial tear gel ($8–$15 per tube) can prevent exposure keratopathy. Annual eye exams with a veterinary ophthalmologist cost $80–$200 per visit.
Related Canine Eye Behaviors to Watch For
- Slow blinking: Both eyes close slowly in sequence — a well-documented calming signal indicating relaxation and trust.
- Whale eye: The dog turns their head away but keeps their eyes fixed on you, showing the whites (sclera). This signals anxiety or resource guarding — give your dog space.
- Hard stare: Unblinking, direct eye contact with a rigid body. This is a threat signal; do not approach a dog displaying this behavior.
- Third eyelid flashing: A brief sweep of the nictitating membrane across the eye. Normal during sleep transitions or sudden head movements, but persistent protrusion warrants veterinary attention.
- Eye-pressing (head pressing): A dog pressing their head or eyes against a wall or surface is exhibiting a neurological emergency — seek immediate veterinary care.
Frequently Asked Questions
Why do dogs wink at their owners?
Dogs wink at their owners primarily as an affiliative social signal rooted in ancestral appeasement behaviors. It communicates trust, relaxation, and social bonding. Some dogs also learn that winking elicits positive reactions from their owners (treats, praise, attention), which reinforces the behavior through operant conditioning.
Can dogs wink intentionally?
Yes, dogs can produce voluntary unilateral eyelid closure, though the degree of conscious intentionality is debated among canine cognition researchers. What is clear is that dogs produce more facial expressions in the presence of humans than when alone, suggesting these signals are at least partially audience-directed rather than purely reflexive.
How do dogs process human facial expressions like winking?
Dogs process human faces using specialized brain regions in the temporal cortex, similar to how humans process faces. Research published in Biology Letters (2016) demonstrated that dogs can distinguish between happy and angry human faces. However, dogs likely interpret a human wink as a brief break in eye contact rather than understanding its cultural meaning.
What does it mean when my dog winks one eye repeatedly?
Repeated winking of the same eye — especially if it's a new behavior — is more likely medical than social. Common causes include a foreign body (dust, grass seed) under the eyelid, corneal abrasion, conjunctivitis, or dry eye. If the behavior persists for more than 24 hours or is accompanied by any discharge or pawing, consult your veterinarian.
Is winking normal in puppies?
Occasional winking can appear in puppies as they develop their social communication repertoire. However, puppies are also more prone to eye injuries from play and environmental exploration. Any persistent squinting or eye closure in a puppy under 6 months should be evaluated promptly, as early treatment of corneal damage prevents long-term vision issues.
How is a dog wink different from a dog squint?
A social wink is brief (under 1 second), deliberate, and the eye opens fully and clearly afterward. A squint (blepharospasm) is sustained, often accompanied by visible tension around the eye, tearing, or the dog turning away from light. Squinting almost always indicates pain or discomfort and is not a social signal.
Sources & Further Reading
- Kaminski, J. et al. (2019). "Domestication did not increase facial expressivity in dogs." Scientific Reports, 9(1). Available via Nature.
- Merck Veterinary Manual — Eye Disorders in Dogs. merckvetmanual.com
- American Veterinary Medical Association (AVMA) — Dog Eye Care. avma.org
- Rugaas, T. (2006). On Talking Terms with Dogs: Calming Signals. Dogwise Publishing.
This article is for educational purposes only and does not replace professional veterinary advice. If you have concerns about your dog's eye health or behavior, consult your veterinarian or a veterinary ophthalmologist.
Beth Carrasco
All our authors care for dogs every day — read more of their work on the authors page.
