A dog eye ulcer (corneal ulcer) is a break in the clear surface of the eye, and it needs an AVS-licensed vet quickly, ideally the same day. Look out for squinting, tearing, redness, cloudiness, pawing at the eye and sensitivity to light. A simple surface ulcer often heals in roughly 3–10 days with prescribed drops and an e-collar, but a deep ulcer can put the eye at risk within 24–48 hours, so this is never a wait-and-see situation.
When a dog suddenly starts squinting, keeps one eye closed or rubs its face along the sofa, a corneal ulcer is one of the most frequent (and most painful) explanations. The cornea is the transparent dome at the front of the eye, and an ulcer is an erosion through its protective outer layer. The cornea is crowded with nerve endings, so even a shallow scratch hurts a lot, which is exactly why affected dogs squint, water and paw at the eye.
This guide covers what a dog eye ulcer looks like, why certain breeds (many of them popular in Singapore flats and condos) are far more prone to them, how vets diagnose and treat ulcers, and, just as importantly, what you should and shouldn't do at home on the way to the clinic. Let's be clear from the start: no rinse belongs on a suspected ulcer. Pure Majesty Pets Dog Eye Drops are a sterile, non-medicated hygiene rinse (ophthalmic-grade, buffered to pH 7.0–7.2) designed for daily cleaning of a healthy, comfortable eye, not a painful one.
What is a corneal ulcer in dogs?
A corneal ulcer, or ulcerative keratitis, is a loss of corneal tissue. The cornea is built in layers, and how deep the ulcer reaches decides how serious it is. A superficial ulcer affects only the outer epithelium; a deeper (stromal) ulcer erodes into the middle layer; and a descemetocele is a deep crater down to the innermost membrane. That last one is a surgical emergency, because the eye can rupture (Merck Veterinary Manual; VCA Hospitals).
A separate and dangerous category is the melting ulcer (keratomalacia). Here, bacterial and inflammatory enzymes rapidly dissolve corneal tissue and the surface takes on a greyish, jelly-like appearance. Melting ulcers can deteriorate within hours and are a genuine emergency.
| Severity | What is involved | Usual outlook |
|---|---|---|
| Superficial | Outer epithelium only (for example, a scratch or abrasion) | Often heals in about 3–10 days with drops and an e-collar |
| Stromal (deep) | Erodes into the middle corneal layer | May need intensive drops or surgery (a graft) |
| Descemetocele | Reaches the last membrane; close to perforation | Surgical emergency, with a risk of rupture |
| Melting | Enzymes liquefy the cornea; soft, greyish look | Emergency; can progress within hours |
| Indolent (SCCED) | Superficial ulcer that will not re-attach and heal | Usually needs debridement, not simply more drops |
Dog eye ulcer symptoms: what to look for
Ulcers hurt, so most of the signs are your dog's attempt to protect a sore eye. Typical dog eye ulcer symptoms include:
- Squinting or keeping the eye shut (blepharospasm), often the first and clearest clue.
- Heavy tearing or watery discharge, sometimes with mucus or pus once infection takes hold.
- Redness in the white of the eye and the inner lids.
- Pawing at the eye or rubbing the face on furniture, rugs or the floor.
- Cloudiness or a bluish haze across part of the cornea (fluid build-up or scarring).
- Light sensitivity: seeking out shade or blinking hard in bright rooms or midday sun.
- In some cases, a visible dent, spot or rough patch on the clear surface.
Tearing, redness and squinting also show up with a squinting or painful eye from many other causes, and cloudiness overlaps with a cloudy or hazy eye. The only way to confirm an ulcer is a veterinary examination with a stain test (see below).
Is a dog eye ulcer an emergency?
Treat every suspected ulcer as urgent. Book a same-day appointment at your vet centre, and head to a 24-hour emergency hospital if you can't be seen quickly. Ulcers can deepen fast, and delayed care is the main reason a treatable surface ulcer turns into one that threatens sight. Singapore has a public AVS registry of licensed veterinary centres (125 entries on the list dated 24 July 2026), so it is worth saving your nearest clinic's number before you ever need it.
See an emergency vet straight away if you notice: a bulging eye or a visible crater; a greyish, "melting" or jelly-like surface; blood or pus inside the eye; the eye getting rapidly worse; or severe pain (your dog won't open the eye at all). These can perforate within 24–48 hours. Round-the-clock options in Singapore include, for example, Beecroft Animal Specialist & Emergency Hospital (991E Alexandra Road, +65 6996 1812), VES Hospital (232 Whitley Road, +65 6266 0232), Westside Emergency (86 Serangoon Garden Way, 6931 0095) and the Bedok branch of Advanced VetCare (26 Jalan Pari Burong, 6636 1788). This is not a complete list.
What causes eye ulcers in dogs?
Most canine corneal ulcers start with an injury; bacterial infection usually follows the damage rather than causing it (Merck Veterinary Manual). Common causes include:
- Trauma: a scratch during rough play at the dog run, a cat's claw, a thorn, or a dash through undergrowth on a park walk.
- Foreign material: grass seeds, sand or grit lodged under the lids (beach walks at East Coast Park are a classic source of sand).
- Chemical irritation: shampoo, dust or spray getting into the eye.
- Dry eye (KCS): too little tear film leaves the cornea unprotected.
- Eyelid and lash problems: entropion (inward-rolling lids) or extra lashes (distichiasis) that rub constantly.
- Reduced blinking and exposure, particularly in flat-faced breeds (next section).
Keeping the eye area clean and free of irritants lowers the everyday risk. If your dog tends to collect debris or tear staining, learning to clean your dog's eyes safely is a sensible habit, though cleaning is prevention and comfort care, never a treatment for an active ulcer. NParks dog-run rules also ask that dogs be "healthy and without any open wounds", so keep an ulcerated dog at home until your vet gives the all-clear (NParks).
Why flat-faced (brachycephalic) breeds are most at risk
If you share your home with a Pug, French Bulldog, Shih Tzu, Boxer, Bulldog or Cavalier King Charles Spaniel, corneal ulcers deserve extra vigilance. Their prominent eyes, shallow sockets and incomplete blink leave more of the cornea exposed and less well lubricated. The figures are striking: in a UK primary-care study of more than 104,000 dogs, brachycephalic breeds had roughly 11 times the odds of corneal ulcerative disease compared with crossbreds, with the highest prevalence in Pugs (5.4%) and Boxers (5.0%) (O'Neill et al., 2017). A referral study of 970 brachycephalic dogs found corneal ulcers were the single most common eye problem in that group (Palmer et al., 2021).
This matters in Singapore. The Pug, Shih Tzu and Cavalier King Charles Spaniel all sit on the HDB list of approved breeds, so many HDB flats are home to exactly the eye shapes most prone to ulcers (the French Bulldog, by contrast, is not on the HDB list and lives mainly in condos and landed homes). AVS also singles out brachycephalic (flat-faced) breeds as a group with particular health concerns, and with daytime highs of 31–33°C all year these dogs often spend long hours in aircon. For these breeds, routine eye checks, prompt attention to any squint, and good facial-fold and eye-area hygiene are worthwhile lifelong habits.
How vets diagnose an eye ulcer
The standard test is quick and painless. The vet puts a drop of fluorescein dye on the eye; the dye clings to exposed corneal tissue and glows green under a blue light, showing the ulcer's size and shape. One revealing detail: a very deep descemetocele may not take up dye in its centre, and that in itself signals danger (Merck Veterinary Manual; VCA Hospitals). Your vet may also measure tear production, look for foreign bodies under the lids and, in stubborn cases, take a sample for culture.
Dog eye ulcer treatment
Treatment depends entirely on the depth and the cause, which is why no supplement, wipe or home remedy can replace a veterinary plan. Prescription medicines are prescribed and supplied through your AVS-licensed vet, and may include:
- Topical antibiotics to control or clear bacterial contamination while the surface heals.
- Atropine drops to relieve the painful muscle spasm inside the eye.
- Autologous serum (drops prepared from the dog's own blood) for infected or melting ulcers, as it helps counter the enzymes that break down the cornea.
- An e-collar (cone), which is non-negotiable, to stop your dog rubbing and reopening the wound.
Deep or perforating ulcers often need surgery, such as a conjunctival graft that reinforces the cornea. A particular type of non-healing surface ulcer, the indolent or SCCED ulcer (sometimes called a "Boxer ulcer"), comes with an important twist: it fails to heal because the new surface can't re-anchor, so more antibiotics won't fix it. It usually needs a minor in-clinic procedure. In a multi-institution study of 194 dogs, around 77% of eyes healed after a single diamond-burr debridement (mean of about 13 days) (Vet Ophthalmol, 2018). If your vet says the ulcer "won't heal on its own", this is usually the reason, and it is not a failure on your part.
Never put human eye drops on a dog eye ulcer. Redness-relieving drops such as Visine (tetrahydrozoline) can be toxic to dogs (Pet Poison Helpline). And drops containing steroids are dangerous when an ulcer is present: they slow healing and can speed up corneal "melting" and infection. Use only what your vet prescribes for that particular eye.
Healing timeline and what recovery looks like
A simple, superficial ulcer often resurfaces within about 3–10 days when it is treated promptly. Your vet will normally recheck with the fluorescein stain to confirm the eye has fully closed: "looks better" is not the same as "healed", and stopping drops too early is a common setback. Deep, infected or surgical cases take longer and need closer monitoring.
Signs recovery is on track: less squinting, a brighter and more open eye, less tearing, and your dog behaving more like its usual self. Call the vet immediately if you see increasing pain, a cloudier or greyer surface, fresh discharge, or an eye that was improving suddenly getting worse.
What to do (and not do) before the vet visit
Do
- Fit an e-collar straight away to stop rubbing.
- Keep your dog calm, indoors and cool; dim bright lights.
- Gently wipe discharge from the outer lids with a clean, damp cloth.
- Book a same-day appointment with an AVS-licensed vet.
- Bring a list of any drops or products you have already used.
Don't
- Don't use human eye drops, redness relievers or leftover medication.
- Don't use any steroid drop or ointment.
- Don't let your dog paw, scratch or rub the eye.
- Don't "wait a day to see if it clears": ulcers can deepen quickly.
- Don't flush an obviously injured eye with anything other than plain saline, and only if your vet advises it.
Where daily eye care fits once the eye has healed
To be clear, no product treats or heals a corneal ulcer; that is a job for veterinary care. Where daily eye care does fit is between problems, as long-term comfort and hygiene for at-risk dogs, especially flat-faced breeds living in Singapore's heat and roughly 82% average humidity. A gentle daily dog eye rinse helps keep the eye area clean and clear of the debris and tear build-up that irritate sensitive eyes, and daily eye and vision support drops provide antioxidant support that may help maintain overall eye health as dogs age. For whole-body support of skin, coat and connective tissue in older dogs, many owners add Pure Majesty Liquid Collagen for Dogs (S$42 for one bottle, or S$84 for three). None of these is a treatment for an active ulcer, and none should delay a vet visit. Every order comes with free worldwide shipping: we ship to Singapore with duties and GST prepaid (DDP), nothing to pay on delivery, usually 5–14 business days after dispatch.
You will also find eye wipes and cleansers at Singapore pet shops, for example Petkin Tear Stain Eye Wipes at Kohepets or MicrocynAH Eye Wash. The same rule applies: they are for routine cleaning, never for a painful, squinting eye. In Singapore, pet supplements are regulated by AVS as animal feed, so check the label and ask your vet if your dog has an ongoing eye condition. For the wider picture, read our complete guide to dog eye health and our overview of the warning signs of a dog eye infection, or browse our full range of dog ear and eye care essentials.
Frequently asked questions
Can a dog's eye ulcer heal on its own?
A very minor abrasion sometimes resurfaces quickly, but you cannot judge depth by eye, and an untreated ulcer can deepen or become infected fast. Because ulcers are painful and can threaten sight, the safe course is to have every suspected ulcer examined promptly by an AVS-licensed vet rather than waiting to see whether it heals.
How long does a corneal ulcer take to heal in dogs?
Simple, superficial ulcers often heal in about 3–10 days with prescribed treatment and an e-collar. Deep, infected, melting or non-healing (indolent) ulcers take longer and may need a procedure or surgery. Your vet confirms healing with a repeat fluorescein stain.
Is a dog eye ulcer painful?
Yes. The cornea is densely supplied with nerves, so even a shallow ulcer hurts, which is why dogs squint, water and paw at the eye. Pain relief, including atropine, is part of veterinary treatment.
Can I use human eye drops or Visine on my dog?
No. Redness-relief drops such as Visine (tetrahydrozoline) can be toxic to dogs, and steroid drops are dangerous when an ulcer is present. Use only medication your vet prescribes for that eye.
Why does my dog's eye ulcer keep coming back or refuse to heal?
A non-healing surface ulcer is often an indolent (SCCED) ulcer, where the cornea cannot re-anchor its new surface. It usually needs a minor in-clinic debridement rather than more drops. Recurring ulcers can also point to an underlying cause such as dry eye or an eyelid problem that needs treating.
Does my dog have to wear a cone?
Yes. The e-collar stops rubbing and pawing, the quickest way to deepen a healing ulcer. Keep it on until your vet confirms the eye has fully healed.
Where can I find an emergency vet for an eye ulcer in Singapore at night?
Several hospitals on AVS's licensed vet centre list are open around the clock, for example Beecroft Animal Specialist & Emergency Hospital, VES Hospital, Westside Emergency and Advanced VetCare's Bedok branch. Call ahead so the team is ready for you.
Scientific references
- Gelatt KN. Disorders of the Cornea in Dogs. Merck Veterinary Manual (Pet Owner version), updated 2024.
- VCA Animal Hospitals. Corneal Ulcers in Dogs.
- O'Neill DG, et al. Corneal ulcerative disease in dogs under primary veterinary care in England: epidemiology and clinical management. Canine Genetics and Epidemiology, 2017;4:5. PMID: 28630713.
- Palmer SV, Espinheira Gomes F, McArt JAA. Ophthalmic disorders in a referral population of seven breeds of brachycephalic dogs: 970 cases. JAVMA, 2021;259(11):1318–1324. PMID: 34727059.
- Diamond burr debridement for spontaneous chronic corneal epithelial defects in dogs (194 dogs). Veterinary Ophthalmology, 2018. PMID: 29536611.
- Pet Poison Helpline. Can You Give Dogs Visine Eye Drops?
A corneal ulcer is a painful condition that can threaten sight and needs prompt veterinary care. Pure Majesty Pets products are wellness supplements and eye-care rinses that support everyday eye comfort; they are not a treatment for corneal ulcers or any disease.
This article is for general information only and is not a substitute for advice from your veterinarian. If your dog shows signs of illness, contact your AVS-licensed vet.