When the Eyelid Works Against the Eye
The eyelids do more than open and close. They protect the cornea, distribute the tear film, and clear debris with each blink. When the eyelid margin rolls in the wrong direction — whether inward or outward — it fails in these functions and begins actively damaging the eye. Entropion and ectropion are the two most common eyelid conformational defects in dogs, and while they sit at opposite ends of the spectrum, both can cause significant discomfort and long-term ocular damage if left unaddressed.
Entropion: The Inward-Rolling Lid
Entropion occurs when the eyelid margin rolls inward so that the skin and lashes contact the surface of the eye. Even fine, soft fur abrading the cornea with every blink causes irritation, and over time this friction leads to corneal ulceration, scarring, pigmentation, and vision impairment. The condition can affect the upper lid, lower lid, or both, and it may be present in one or both eyes.
Breeds Commonly Affected
Entropion is strongly linked to breed conformation. Chow Chows, Shar Peis, English Bulldogs, Rottweilers, Labrador Retrievers, Golden Retrievers, Great Danes, and many spaniels are among the most commonly affected. In flat-faced breeds, the facial skin folds and prominent globe shape contribute to lid rolling. In larger working breeds, deep-set eyes and heavy facial skin are the primary risk factors.
Signs of Entropion
Affected dogs typically show persistent squinting or blinking, excessive tearing, mucoid or purulent discharge, and repeated corneal ulcers. In chronic cases, the cornea may develop a brown pigmentation (pigmentary keratitis) or visible scarring that impairs vision. Puppies with severe congenital entropion may keep the eye closed almost entirely.
Ectropion: The Outward-Drooping Lid
Ectropion is the opposite problem: the lower eyelid droops away from the eye, exposing the conjunctiva and leaving the eye poorly protected. The characteristic droopy, hound-like expression is considered a breed standard feature in several dogs — Bloodhounds, Basset Hounds, Saint Bernards, and Newfoundlands, for example — but moderate to severe ectropion can cause chronic conjunctivitis, exposure keratitis (drying and damage to the cornea), and repeated infections due to debris accumulating in the exposed conjunctival pocket.
Signs of Ectropion
A reddened, exposed conjunctiva is the most visible sign. Persistent watery or mucoid discharge, recurrent conjunctivitis, and a dog that frequently rubs at its eyes are common presentations. The lower lid may sag noticeably, and in severe cases the corneal surface appears dry or dull due to inadequate tear distribution.
Diamond Eye and Combined Defects
Some dogs — particularly those with very loose facial skin — develop a combination of ectropion at the central lower lid and entropion at the corners of the eye. This creates a diamond-shaped eyelid opening rather than the normal almond shape, and is sometimes referred to as diamond eye or macroblepharon with combined eyelid defects. It requires careful surgical planning to correct, as overcorrection of one component can worsen the other.
Diagnosis and When to Consider Surgery
Diagnosis is made on clinical examination. The vet will assess the eyelid position, degree of corneal contact or exposure, presence of corneal damage, and overall ocular health. Mild cases may be monitored rather than immediately treated, particularly in young puppies whose facial conformation is still developing — some cases of puppy entropion improve as the face matures. Temporary tacking sutures, which roll the lid outward without removing tissue, can be used in puppies to protect the cornea until they are old enough for definitive surgery.
Surgery is recommended when the defect is causing active corneal damage, chronic pain, recurrent infections, or a measurable reduction in quality of life. Waiting too long carries the risk of permanent corneal scarring that surgery cannot reverse.
Surgical Correction
Correcting Entropion
The standard procedure for entropion is a Hotz-Celsus technique, in which an ellipse of skin is removed just below the affected eyelid margin to evert it to a normal position. The size and placement of the ellipse must be precisely calculated — undercorrection leaves the problem unresolved, while overcorrection creates ectropion. The surgery is performed under general anaesthesia and typically requires a short recovery period with an Elizabethan collar and topical medication.
Correcting Ectropion
Ectropion repair typically involves shortening the lower eyelid using a wedge resection, tightening the lid margin back against the globe. In cases with significant skin laxity, additional procedures to address the surrounding skin and lateral canthal ligament may be needed. Outcome is generally very good, with significant improvement in comfort and reduction of discharge.
Breed Considerations and Recheck Examinations
Dogs of high-risk breeds should have eyelid conformation assessed by a vet from puppyhood onwards. Breeding dogs with significant entropion or ectropion is discouraged, and several breed health committees actively recommend against selecting for extreme conformations that predispose to these defects. Post-surgical recheck examinations are important to confirm the correction is stable and the cornea is healing.
Key Takeaways
- Entropion rolls the lid inward causing lashes to abrade the cornea; ectropion droops the lid outward causing exposure and infection
- Several common breeds have congenital predisposition linked to facial conformation
- Corneal ulcers, chronic squinting, discharge and pigmentation are warning signs of lid defect complications
- Surgery is recommended when active corneal damage or chronic discomfort is present
- Temporary tacking sutures can protect puppies while they mature before definitive correction
- Consult a vet experienced in ophthalmic surgery or request referral to a veterinary ophthalmologist for complex cases