TL;DR: If your dog cannot close their eye, it indicates a serious condition that can lead to painful corneal ulcers and vision loss. You should contact a veterinarian within 12 to 24 hours to prevent permanent damage to the eye.
What does it mean if my dog is unable to close their eye?
When a dog is unable to close their eye—a condition medically referred to as lagophthalmos—it typically indicates an issue with the facial nerve or the muscles that control the eyelid. Because the blink reflex is responsible for spreading tears and protecting the eye from debris, an inability to close the eye leads to rapid drying of the cornea. This can quickly result in painful inflammation, corneal ulcers, and potential vision loss.
Is my dog's inability to close their eye considered a veterinary emergency?
- This situation is classified as Medium Urgency; while not a life-threatening systemic emergency, the health of the eye is at immediate risk.
- You should contact a veterinarian within 12 to 24 hours for an exam.
- Seek care as soon as possible if you notice secondary signs such as extreme redness, a cloudy appearance to the eye, or if your dog is pawing at their face in pain to prevent permanent damage.
How can taking a photo of my dog's eye help with veterinary triage?
- A high-quality image allows a professional to assess the degree of exposure and look for signs of a corneal ulcer.
- Clear photos help the medical team check for facial symmetry to determine the priority of your appointment.
- A photo provides a vital visual baseline to monitor if the condition is improving or worsening over time.
Clinical Context (Merck Veterinary Manual)
Lagophthalmos, the inability to fully close the eyelids, exposes the cornea to drying and trauma. Causes include shallow orbits (common in brachycephalic breeds), exophthalmia from orbital lesions, and facial nerve paralysis. Ectropion, a slack, everted lid margin, can also lead to conjunctival exposure and secondary bacterial infection, potentially causing chronic or recurrent conjunctivitis. Facial nerve paralysis may produce unilateral ectropion. Traumatic proptosis, where the globe is luxated from the orbit due to trauma, can also lead to eyelid spasms preventing retraction and subsequent corneal drying. Treatment for lagophthalmos and ectropion includes topical antibiotic-corticosteroid preparations, surgical lid-shortening, or lavage with decongestant solutions. In traumatic proptosis, treatment begins with providing moisture to lubricate the exposed corneoconjunctiva, followed by general anesthesia and lateral canthotomy with temporary tarsorrhaphy.
Chapter: Ophthalmology, Surgery
Source: The Merck Veterinary Manual, 11th Edition (Page 489)