Eye problems in dogs: squinting, injuries and sudden sight changes
What to do now
Call a vet immediately for an injured or very painful eye, an eye held closed, sudden sight loss, a bulging eye, blood in the eye or a sudden cloudy appearance. Do not wait overnight to see whether these improve. Prevent rubbing if a protective collar can be fitted calmly without pressing on the eye. Do not force the eyelids open, remove an embedded object or put pressure on the eyeball.
Emergency? Call a vet nowUnderstand painful, red or cloudy eyes, safe immediate protection and why some eye problems need emergency treatment.
Veterinary help in your selected country
Phone your usual vet; their recorded message should explain out-of-hours arrangements. If unavailable, contact a local emergency veterinary hospital. Confirm that it can receive your dog before travelling if possible; do not delay urgent care. Human emergency numbers are not veterinary helplines.
Open country-specific veterinary contactsUnderstanding the signs
Squinting, repeated blinking, tears, light avoidance and face rubbing can indicate pain rather than tiredness. Discharge alone cannot distinguish a simple surface inflammation from an ulcer or another serious problem. Bumping into objects or hesitating at steps may indicate reduced sight. Compare the eyes without handling them: a new difference in pupil size, colour or shape is useful information for the vet.
Possible causes
The cornea is the clear front surface of the eye; an ulcer is a break in that surface. Scratches, grass seeds, eyelid problems and inadequate tears can damage it. Glaucoma is increased pressure inside the eye and can rapidly damage vision. Inflammation inside the eye, infection and trauma can look similar to an owner. Flat-faced dogs have more exposed eyes and may be particularly vulnerable.
Cloudiness is not automatically normal ageing or a cataract.
Safe practical steps
Keep the dog calm and away from sharp vegetation and other animals. Use a lead to guide a dog whose vision has changed and block access to stairs. Do not use human redness drops, old prescriptions or another animal’s eye medicine: the correct treatment depends on the cause and some medicines can worsen an ulcer.
Do not clean the eye with homemade salt water or antiseptic. After a chemical splash, begin gentle irrigation with plenty of clean lukewarm water or sterile saline while someone contacts the vet; avoid contaminating the other eye and do not attempt to neutralise the chemical. A suspected penetrating injury needs protection without flushing or manipulation unless the vet directs otherwise.
What the vet may do
The vet may check vision, pupils and eyelids, stain the cornea to reveal an ulcer, measure tear production or measure pressure inside the eye. Tests are selected according to the injury; a fragile eye needs careful handling. Treatment may include prescribed drops, pain relief, removal of a foreign body under appropriate restraint or sedation, or specialist surgery.
Glaucoma requires rapid pressure control; deep or non-healing ulcers may need referral.
Recovery, recurrence and prevention
Keep the collar on as directed and attend rechecks even if the eye appears better: surface healing sometimes needs repeat staining. Follow the precise drop schedule and ask before stopping treatment. Increased squinting, redness, cloudiness or loss of sight needs urgent reassessment. Treating dry eye or eyelid abnormalities and reducing avoidable trauma may help prevent recurrence.
Common questions
Can I wait because only one eye is affected?
No. A serious ulcer or glaucoma may initially affect one eye; pain or sudden changes need urgent assessment.
Does sticky discharge prove an infection?
No. Dry eye, irritation and ulcers can also cause discharge, so choosing drops by appearance is unsafe.
Can I remove a visible grass seed?
Do not dig under eyelids or pull anything embedded in the eye. A vet can examine and remove it safely.
Will sight return after treatment?
That depends on the cause and damage. Prompt treatment protects the best possible chance, but recovery cannot be promised.
Sources and editorial review
Sources below are in English. Clinical advice is general; veterinary services and treatment availability depend on your selected country.
Editorial evidence and language checks: 24 October 2026. This information cannot diagnose your dog. No independent veterinary clinical review has taken place.