Dog Corneal Ulcer: Recognising and Treating a Painful Ocular Emergency

Corneal ulcers are painful eye injuries requiring prompt diagnosis and treatment. Rapid response prevents progression to severe complications that compromise both vision and welfare.

Key Facts

Corneal ulcers result from trauma, infection, or anatomical predisposition, particularly in brachycephalic breeds
Signs include squinting, discharge, tearing, rubbing the eye, and visible cloudiness or opacity
Superficial ulcers heal within 5-7 days with appropriate treatment; deep or complicated ulcers require specialist care
Pseudomonas and other bacterial infections can cause rapid, devastating corneal progression within 24-48 hours
Brachycephalic breeds have shallow orbits and impaired blink reflexes — corneal ulceration is a lifelong risk
Never use steroid eye drops in a dog with an undiagnosed red eye — they worsen ulcers significantly

Welfare Considerations

Corneal ulcers cause acute, significant pain. The eye is among the most densely innervated tissues in the body — even superficial ulcers cause intense photophobia, blepharospasm, and ocular discomfort. The welfare urgency of prompt diagnosis is compounded by the rapid progression possible with bacterial infection: an ulcer that appears manageable in the morning can progress to corneal perforation by evening with the wrong treatment or delayed intervention. Brachycephalic breed owners must be particularly vigilant — their dogs' anatomical vulnerability to corneal exposure means ulcers are a recurrent welfare risk throughout life. Prompt treatment with appropriate antibiotics, pain relief, and protective collars provides the welfare response.

What You Can Do

Seek same-day veterinary assessment for any dog showing signs of eye pain — corneal ulcers are emergencies
Never use steroid eye drops without veterinary confirmation that no ulcer is present
Fit an E-collar to prevent eye rubbing that worsens ulcers during treatment
Monitor brachycephalic dogs closely for eye signs — their anatomy makes them high-risk throughout life
Return for follow-up assessments during treatment — ulcer response to treatment must be confirmed