Corneal Ulcers in Rabbits: Signs, Causes, and When to See a Vet

A corneal ulcer is a painful erosion of the eye's clear surface. Rabbits are unusually prone to them due to their prominent eyes and thin cornea. Squinting, a watery or cloudy eye, or pawing at the face warrants a same-day vet call, since untreated ulcers can deepen fast — don't put anything in the eye, including saline rinses, until a vet has examined it.

Corneal ulcers are common in pet rabbits for mostly anatomical reasons. Here's what one looks like, why rabbits get them, and when it's urgent.

What Does a Corneal Ulcer Look Like in a Rabbit?

The most common signs are a squinted or partly closed eye, excess tearing, and a cloudy or blue-white haze where the cornea has eroded. You may also see face-rubbing, redness, discharge ranging from clear to thick yellow-green if infected, or reduced appetite from pain. Rabbits blink only once every 5 to 6 minutes, so an irritated eye tends to look "held shut" rather than blinking rapidly like a dog's, making it easy to miss early (Slatter's Fundamentals of Veterinary Ophthalmology, 2008).

Why Are Rabbits So Prone to Corneal Ulcers?

Rabbit eyes are built for a wide field of view, not for shielding the cornea. Their large, laterally placed eyes give nearly 360-degree vision, but leave less orbit and eyelid coverage protecting the cornea, which is also notably thin — about 0.36mm versus roughly 0.56mm in dogs — leaving less tissue for an ulcer to work through before it turns serious (Slatter's Fundamentals of Veterinary Ophthalmology, 2008). Combined with the slow blink rate above, debris like dust or hay chaff clears less often, predisposing rabbits to trauma and slow-healing ulcers alike.

What Causes Corneal Ulcers in Rabbits?

Trauma is the leading cause — hay stalks, dust, or bedding fibers scratching the cornea, or scuffles with a cagemate. A second pathway is dental disease: overgrown molar roots can press on the nasolacrimal duct, which takes an unusually tortuous path past the tooth roots toward the nose, blocking it and causing dacryocystitis (an infected tear duct) that predisposes the cornea to ulceration. In one study of 821 pet rabbits, dacryocystitis was identified in 6.7%, and dental disease was present in 45% of those cases (Hedley et al., 2022). Bacterial infection and eyelid conformation issues like entropion round out the remaining causes.

How Are Corneal Ulcers Diagnosed and Treated?

Vets diagnose a corneal ulcer with a fluorescein stain test: a drop of dye is applied, and any eroded area glows green under blue light. Uncomplicated ulcers are typically managed with a vet-prescribed topical treatment at home, while non-healing, infected, or deeper ulcers need more intensive care, sometimes including referral to a veterinary ophthalmologist. Your vet will also treat the underlying cause — flushing a blocked tear duct, treating dental disease, or correcting an eyelid abnormality — since the ulcer is likely to recur otherwise. A short-term e-collar often prevents further self-trauma while it heals.

When to See a Vet

Call your vet today if:

• Your rabbit is squinting, holding an eye partly or fully closed, or has tearing or discharge
• You see cloudiness, a white/blue haze, or redness on the eye
• Eye symptoms come with drooling, pawing at the face, or reduced appetite

Go to the ER immediately if:

• The eye appears to bulge, has a visible hole, or looks ruptured
• There's sudden, severe swelling around the eye or face
• Your rabbit has stopped eating along with eye symptoms — rabbits can develop life-threatening GI stasis within hours
• A cloudy area appeared suddenly with obvious pain, signaling a deep ulcer at risk of rupture

Frequently Asked Questions

Can a rabbit's corneal ulcer heal on its own? Superficial ulcers can heal within days once a vet starts treatment, but shouldn't go untreated — rabbits' thin cornea gives an ulcer less room to work with, and some become "indolent" (non-healing) without intervention.

Why does my rabbit keep one eye closed? A closed or squinted eye is a clear pain signal, often pointing to a corneal ulcer, conjunctivitis, or a blocked tear duct. Since rabbits blink only a few times an hour, an eye that stays shut is a stronger warning sign than in a dog.

Is a corneal ulcer an emergency in rabbits? It can be. Mild, superficial ulcers usually warrant a same-day visit, but a rapidly worsening, deep, or ruptured-looking ulcer is an emergency, since rabbit corneas are thin and can perforate.

How much does it cost to treat a corneal ulcer in a rabbit? A basic exam typically runs $50-150, though exotic/rabbit-savvy vets often charge roughly 1.5-2x standard rates. Bloodwork runs another $100-250, and complex or non-healing ulcers needing ophthalmologist referral cost more.

Can dental problems cause eye problems in rabbits? Yes — overgrown molar roots can press on the nasolacrimal duct and block it, causing a tear duct infection that predisposes the eye to ulcers. Dental disease was found in 45% of rabbits with this kind of tear duct infection in one clinical study.

What causes corneal ulcers in rabbits? Mainly trauma from hay, dust, or bedding scratching the eye; dental disease blocking the tear duct; bacterial infection; and eyelid conformation issues like entropion in certain breeds.

Should I use saline or eye drops at home before seeing a vet? No — avoid putting anything in your rabbit's eye until a vet has examined it. Some products can worsen an ulcer or interfere with the fluorescein stain test used to diagnose it.

Still Not Sure if Your Rabbit Needs a Vet?

This article covers what's typical. Your rabbit's breed, age, and history change what "wait and see" vs. "call tonight" means for them. Voyage AI Vet triages in under 2 minutes — describe what you're seeing in chat, share photos, or hop on video for a second pair of eyes, with citations to the literature behind every answer.

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