What Is Entropion in Dogs? (Causes and Severity)

Entropion in dogs is an eyelid that rolls inward toward the eyeball, so the outer eyelid skin and the hair on it press and rub against the surface of the eye instead of sitting cleanly along the edge. If your dog is squinting, tearing, pawing at an eye or holding one eye shut, book a veterinary exam promptly, because the constant rubbing scratches the cornea and corneal damage can worsen quickly. Sudden intense pain, a cloudy or bluish eye, blood-tinged discharge, or an eye your dog will not open at all means same-day or emergency care rather than a wait-and-see week.

Entropion is a mechanical problem, not an infection. The eyelid is in the wrong position, and every blink drags hair across a surface that is designed to be touched only by tear film. Most cases involve the lower lid, though the upper lid can roll too, and one eye or both can be affected. It is one of the more frequently diagnosed eyelid abnormalities in dogs, and certain breeds are affected far more often than others.

How an inward-rolling eyelid damages the eye

A normal eyelid margin is a smooth, hairless edge. It spreads tear film across the cornea with each blink and sweeps debris toward the inner corner. When the margin rolls inward, that engineering is inverted: haired skin now sits against the cornea, and the blink that should be protective becomes abrasive.

The cornea is the clear front window of the eye and it is densely supplied with nerve endings, which is why even a small surface injury hurts so much. Persistent rubbing tends to produce a predictable chain of changes. First comes irritation and reflex tearing. Then conjunctival redness and discharge. With continued contact, the surface cells break down into a corneal ulcer, and an ulcer can deepen if it is not managed.

Longer-standing cases often show brown pigment creeping across the cornea, along with scarring and new blood vessel growth, which are the eye's attempts to protect and repair itself. Both reduce clarity. In the worst cases, a deep ulcer can perforate, which is a sight-threatening emergency.

What it looks like at home, and what photos actually show

Owners usually notice behaviour before they notice anatomy. Common signs include squinting or rapid blinking, watery eyes, a wet or rust-coloured tear stain running down the face, mucoid discharge, rubbing the face on carpet or furniture, pawing at the eye, avoiding bright light, and a general reluctance to be touched around the head.

Look at the eyelid edge itself in good daylight. In an affected eye you may see that the lid margin is no longer visible as a clean line, that the eyelashes point toward the eyeball rather than away from it, that hair appears to disappear into the eye at the lid edge, and that the eye looks smaller or more closed than its partner. The third eyelid may be raised across the inner corner.

If you search for pictures of entropion in dogs, most show the same thing: a partly closed, weeping eye with the lower lid curled inward and lashes in contact with the cornea, often with redness around the white of the eye. Photographs are genuinely useful, with two caveats. Spastic squinting comes and goes, so an eye can look near normal in a relaxed moment and obviously rolled in when the dog is uncomfortable. And several very different problems, including a foreign body, a corneal ulcer, dry eye, glaucoma and distichiasis, can look almost identical in a photo. Take clear close-ups from the front and the side to show your veterinarian, then let the exam settle what is actually happening.

What causes entropion in dogs

There are two broad routes to an inward-rolling eyelid.

Primary or developmental entropion is the common one, and it comes down to inherited facial conformation: the relationship between the size and shape of the skull, the orbit, the eyeball and the amount of facial skin. Heavy brows, deep facial folds, loose skin, a short or very long muzzle, deep-set or prominent eyes, and strong tension in the ligaments at the corners of the eye all change how the lid sits. Research suggests a hereditary basis in many predisposed breeds, which is why responsible breeding programmes take eyelid conformation seriously and why affected dogs are generally not bred.

Breeds described as predisposed include the Shar Pei, Chow Chow, bulldog breeds, Rottweiler, Labrador and Golden Retriever, Great Dane, Mastiff, Bullmastiff, Saint Bernard, Bloodhound, Cocker Spaniel, Pug and Shih Tzu. Being on that list does not mean a dog will develop entropion, and dogs outside it can still be affected.

Secondary or acquired entropion develops in an eyelid that was previously normal. The usual drivers are pain, scarring and loss of volume behind the eye. A painful eye squeezes shut, and hard squeezing can pull the lid inward, which creates spastic entropion: the rubbing then causes more pain, and the loop tightens. Scarring from a bite wound, laceration, chronic infection or previous eyelid surgery can tether the lid inward, which is called cicatricial entropion. Older dogs, dogs that have lost significant weight or muscle mass around the head, and dogs with reduced fat behind the eye can develop entropion simply because the eye sits deeper in the socket and the lid loses its support.

Because the primary and secondary forms are managed differently, working out which one you are dealing with is the first job of the exam, not a judgement call to make at home.

Unilateral, bilateral, double and medial: the words your vet will use

Entropion is described by which lids are involved and how severe the roll is. The vocabulary sounds technical but each term just describes a pattern.

Term	What it means	Typical context
Unilateral	One eye affected	Often secondary, for example after an injury or alongside an ulcer
Bilateral	Both eyes affected	Common in inherited, conformation-driven cases
Double entropion	Upper and lower lids of the same eye both roll inward	Seen in heavy-skinned, heavily folded breeds such as the Shar Pei
Medial entropion	The inner corner of the lid rolls in	Frequent in brachycephalic and small breeds, often with tear staining
Spastic entropion	Roll driven by painful squeezing of the lid	Linked to an ulcer, foreign body or other painful eye condition
Cicatricial entropion	Roll caused by scar tissue pulling the lid	Follows trauma, chronic inflammation or earlier surgery

Entropion occurs in cats as well as dogs, though it is diagnosed less often. In cats it is seen in flat-faced breeds such as Persians and Himalayans, and it frequently appears as a secondary problem in older, thin cats or those with long-standing conjunctival inflammation. The anatomy and the consequences are the same: hair on cornea, pain and surface damage.

Is it painful, serious, or an emergency?

Yes, entropion is painful. The cornea is one of the most sensitive tissues in the body, and dogs are good at absorbing chronic discomfort quietly. Many owners only realise how sore their dog was once the problem is corrected and the squinting and face-rubbing stop.

Is it serious? The eyelid position itself is not life-threatening, but what it does to the cornea over time can threaten vision, and untreated ulcers are the real risk. Entropion will not resolve with eye drops alone, and corneal damage from constant rubbing is cumulative, so an early veterinary exam matters far more than waiting to see whether the eye settles on its own.

Is it an emergency? Usually it is an urgent problem rather than a middle-of-the-night one, but it crosses into emergency territory when the eye looks or behaves dramatically worse. Seek immediate care for a suddenly cloudy, blue or hazy eye, visible depression or crater on the eye surface, bleeding or blood-tinged discharge, an eye that bulges or looks the wrong shape, rapidly worsening pain, or an eye clamped shut that your dog will not let you near. Talk to your vet the same day for persistent squinting, discharge or redness that has lasted more than a day, even when your dog seems otherwise bright.

Does entropion go away on its own, and how is it corrected?

In adult dogs with inherited, conformation-driven entropion, the answer is no. The lid will not reposition itself, and lubricants or antibiotic ointments manage the consequences without changing the anatomy that caused them.

There are two real exceptions. Puppies and young dogs sometimes have entropion that changes as the skull and facial tissues mature, so veterinarians often use temporary measures such as eyelid tacking sutures to hold the lid outward while growth continues, deferring any permanent decision. And spastic entropion driven by another painful condition can improve once the underlying cause is treated, which is one reason a veterinarian may numb the eye during the exam to see whether the lid relaxes back into position.

When correction is needed, surgical repair is the standard approach. The most common technique removes a carefully measured crescent of skin below or above the lid so the margin rolls back out, and severely folded breeds may need staged procedures rather than a single large correction. Aftercare normally involves a protective collar, medicated drops or ointment and a recheck. Results vary from dog to dog, and under-correction or over-correction can happen, so revision surgery is sometimes part of the picture. Costs vary widely by clinic and region, and insurers often treat entropion as pre-existing if it was noted before the policy started, which is worth checking early.

Key Takeaways

• Entropion is an eyelid that rolls inward so skin and hair rub the cornea. It is a structural problem, not an infection.
• It is painful, and the main risk is corneal ulceration, pigment and scarring that can affect vision.
• Most cases are inherited and tied to facial conformation, with strong breed predispositions. Secondary cases follow pain, scarring or loss of volume behind the eye.
• Bilateral means both eyes, double entropion means upper and lower lids of the same eye, and medial entropion affects the inner corner.
• Cats get entropion too, more often as a secondary problem.
• Adult inherited entropion does not correct itself. Some juvenile and spastic cases change with growth or once the underlying cause is managed.
• A cloudy eye, visible crater, bleeding or sudden severe pain is an emergency.

Your veterinarian owns the diagnosis and the treatment plan here. An ophthalmic exam, including corneal staining and a check for an underlying painful trigger, is what separates primary entropion from a secondary roll, and that distinction decides whether the next step is monitoring, temporary tacking or surgical correction. Talk to your vet about what you are seeing, bring your photos, and let the exam, not the internet, set the course for your dog's eye.

For a wider checklist of signs that warrant urgent attention, read Dog Emergency Signs.