Eye Injuries and Corneal Ulcers in Pets: First Aid and Treatment

Eye injuries are among the most common reasons for urgent vet visits — and among the most time-sensitive. The cornea (the clear, dome-shaped front surface of the eye) is only about 0.5mm thick in dogs and even thinner in cats. Even a minor scratch can quickly become a serious problem if left untreated.

"I treat eye injuries as emergencies until proven otherwise. A superficial corneal scratch can heal in 3–5 days with proper treatment. But that same scratch, if infected with Pseudomonas bacteria, can perforate the cornea in 24 hours. The difference between a good outcome and losing an eye is often just timing." — Dr. Sarah Chen, DVM

The most frequent eye injuries in pets:

• Corneal abrasions (scratches) — from cat fights, running through bushes, rough play with other dogs, or rubbing itchy eyes against rough surfaces
• Foreign bodies — grass seeds (awns) are the classic culprit; also plant thorns, sand, grit, and small insects lodged under the eyelid or in the conjunctival pocket
• Blunt trauma — ball impact, running into furniture or fences, car accidents
• Cat scratches — a cat's claw can penetrate the full thickness of a dog's (or another cat's) cornea in a single swipe
• Chemical exposure — household cleaners, garden chemicals, or shampoo splashed into the eye
• Proptosis — the eyeball is displaced forward out of the socket; most common in brachycephalic breeds (Pugs, Shih Tzus) after trauma

For brachycephalic breeds with prominent, exposed eyes, even minor bumps can cause significant injury. These breeds deserve extra vigilance. Our pet first aid guide covers essential emergency skills every owner should know.

Your actions in the first minutes after an eye injury can significantly affect the outcome. Here's what to do — and critically, what not to do:

Do:

• Prevent rubbing — this is your top priority. Put an e-collar on immediately if you have one. If not, gently restrain your pet or have a helper hold their paws away from the face. Every rub worsens the injury
• Flush with saline or clean water — if you suspect a chemical splash or foreign body, gently flush the eye with sterile saline (contact lens solution works) or lukewarm clean water for 5–10 minutes. Hold the eyelids open and let the liquid flow across the eye from inner to outer corner
• Keep the eye moist — if you have artificial tears (not medicated drops), apply them to keep the cornea hydrated on the way to the vet
• Cover gently — for severe injuries, a damp, clean cloth loosely held over the eye can protect it during transport. Don't apply pressure
• Go to the vet immediately — eye injuries are same-day emergencies. Call ahead so they're ready for you

Do NOT:

• Try to remove embedded objects — if something is stuck in or through the eye, leave it. Removal can cause the eye contents to leak out. Stabilise and transport
• Apply any eye medication without vet guidance — human eye drops (Visine, Optrex) contain vasoconstrictors and other chemicals that can harm the pet eye. Steroid-containing drops on a corneal ulcer can cause it to melt and perforate
• Force the eye open — if the pet is clamping it shut, they're protecting it. Forcing it open risks further damage
• Apply pressure to the eye, even if bleeding
• Wait and see — eye conditions deteriorate rapidly. A scratch that looks minor at 8am can be a perforating ulcer by evening

A corneal ulcer is a defect (erosion or hole) in the corneal surface. They range from superficial scratches to deep, infected craters that threaten the eye itself.

Diagnosing Ulcers — The Fluorescein Test

Your vet will apply fluorescein dye (a bright orange-green stain) to the eye. The dye adheres to exposed corneal tissue (where the surface epithelium is missing) and glows under blue light, revealing the ulcer's exact size, shape, and depth. This painless, 30-second test is the gold standard for diagnosis.

Types of Corneal Ulcers

Superficial ulcers:

• Affect only the outermost layer (epithelium)
• Heal within 3–7 days with topical antibiotic drops and pain management
• The most common type; caused by minor trauma

Deep ulcers (stromal):

• Extend into the corneal stroma (the thick middle layer)
• Higher risk of infection and perforation
• Require aggressive topical antibiotics (often hourly initially), atropine for pain, and possibly surgical repair

Melting ulcers (keratomalacia):

• The most dangerous type — bacterial enzymes (especially from Pseudomonas) literally dissolve the corneal tissue
• The cornea appears gelatinous, white, and soft
• Can perforate within 24 hours. Requires emergency intervention: intensive topical antibiotics (every 1–2 hours), serum eye drops (made from the patient's own blood), and often emergency surgery

Indolent ulcers (SCCED / Boxer ulcers):

• Superficial ulcers that fail to heal normally because the new epithelium doesn't adhere to the underlying stroma
• Common in middle-aged to older dogs, especially Boxers, Corgis, and Golden Retrievers
• Treatment involves debridement (removing the loose epithelial edges) and grid or punctate keratotomy (creating tiny scratches in the stroma to promote adhesion)

Treatment intensity scales with ulcer severity. Here's what to expect for each scenario:

Simple Superficial Ulcer (Most Common)

• Topical antibiotic drops — chloramphenicol, ofloxacin, or fusidic acid; 3–4 times daily for 7–10 days
• Atropine drops — dilate the pupil to reduce painful ciliary spasm; typically once daily
• Oral pain relief — NSAID (meloxicam) for 3–5 days
• E-collar — essential to prevent rubbing
• Recheck — fluorescein stain at 5–7 days to confirm healing
• Healing time: 5–7 days

Deep or Infected Ulcer

• Intensive topical antibiotics — fortified antibiotics (made by the pharmacy from injectable drugs) every 1–2 hours around the clock initially, then gradually reducing
• Culture and sensitivity — swab before starting antibiotics to identify the organism
• Serum eye drops — the patient's blood is drawn, serum separated, and used as eye drops; contains natural anti-collagenase enzymes that slow melting
• Surgery if needed:
• Conjunctival graft — a flap of conjunctival tissue is sutured over the ulcer, providing blood supply and structural support
• Corneal transplant — a patch of donor cornea or biosynthetic material is grafted over a deep defect
• Temporary tarsorrhaphy — the eyelids are partially sutured closed to protect the cornea while it heals
• Healing time: 2–6 weeks depending on depth and infection

Indolent Ulcer Treatment

• Debridement — under topical anaesthetic, loose epithelium is gently wiped away with a dry cotton-tipped applicator
• Grid or diamond burr keratotomy — superficial scratches or polishing of the stroma surface to promote adhesion
• Bandage contact lens — placed over the cornea to protect the healing surface (used in some centres)
• Healing time: 2–4 weeks after the procedure; may need repeating if the first attempt doesn't take

While not all eye injuries are preventable, these practical measures significantly reduce the risk:

For All Pets

• Trim overgrown hair around the eyes — hair rubbing against the cornea is a common cause of chronic irritation and ulcers, especially in Shih Tzus, Lhasa Apsos, and similar breeds
• Keep nails trimmed — both your pet's and any other animals in the household. Cat scratches are a leading cause of corneal injuries in dogs
• Separate rough-playing animals during unsupervised time — particularly cat-dog households where play styles differ
• Avoid throwing sticks — sticks are a common cause of ocular and oral injuries. Use rubber toys instead
• Store chemicals safely — keep cleaning products, garden chemicals, and aerosol sprays away from pets

For Brachycephalic (Flat-Faced) Breeds

• These breeds have shallow eye sockets and prominent eyes that are far more vulnerable to injury and drying
• Daily eye checks — look for redness, discharge, or squinting
• Lubricating eye drops — artificial tears 1–2 times daily if recommended by your vet
• Avoid situations with eye-level hazards — low bushes, cats, small rough-playing dogs
• Use a harness, not a collar — tight collars can increase intraocular pressure and contribute to proptosis risk during sudden pulling

For Outdoor and Working Dogs

• Protective dog goggles (Doggles) — seriously effective for dogs that work in dusty environments, run through underbrush, or ride in open vehicles
• Check eyes after field walks — grass seeds (awns) can lodge behind the third eyelid and cause rapid ulceration if not removed within hours

The eye is resilient but unforgiving — minor injuries heal beautifully with prompt treatment, but delays of even a day can turn a simple scratch into a sight-threatening emergency. When in doubt, call your vet. For more on building a pet first aid kit, see our essentials guide.