Is your dog constantly tearing up, with red eyes or discharge building up in the corners? Almost every dog owner experiences this at some point. Most of the time it is a minor irritation — but sometimes it is the first sign of a serious eye disease. Below you will find what each symptom means and when you should seek a veterinary ophthalmologist without delay.
What do watery eyes and redness mean?
Watering and redness are symptoms, not diseases. The eye responds to irritation, infection, allergy, or changes in intraocular pressure by turning red and producing more tears. The real goal is not to suppress the symptom but to find the underlying cause. Proper treatment is only possible after an accurate diagnosis.
Most common causes
- Conjunctivitis (pink eye): Inflammation of the eye discharge and inner eyelid; accompanied by redness and discharge.
- Allergy and irritation: Pollen, dust, smoke, or an unsuitable shampoo can cause excessive tearing.
- Corneal injury or foreign body: A scratch, splinter, or dust irritates the cornea; the dog squints.
- Dry eye (KCS): Insufficient tear production, presenting with thick, sticky discharge.
- Blocked tear duct: Especially in small breeds, causes tears to constantly overflow from the corner of the eye.
- Eyelid and eyelash problems (entropion, distichiasis): An inward-turning eyelid or abnormal lashes rub against the cornea.
- Glaucoma (intraocular pressure): If redness is accompanied by pain, eye enlargement, and cloudiness, this is an emergency.
Which signs require immediate attention?
Some findings can lead to permanent vision loss within hours. If any of the following are present, see a veterinary ophthalmologist without delay:
- Keeping the eye completely closed or severe squinting
- Cloudiness, bluish, or grayish color in the cornea
- Sudden eye enlargement or protrusion
- Heavy, yellow-green, or bloody discharge
- Sudden decrease in vision, bumping into objects
What can you do at home?
- Gently wipe away discharge from the corner of the eye with a clean, damp cotton pad, wiping outward (use a separate pad for each eye).
- Trim or keep back any fur touching the eye.
- Protect the environment from dust, smoke, and aerosol products.
- If your dog is rubbing the eye with its paw, use a protective collar (cone).
What should you not do?
- Do not use eye drops meant for humans, especially those containing corticosteroids; they can rapidly worsen a corneal ulcer.
- Do not allow your dog to rub or scratch its eye.
- Do not wait days expecting it to resolve on its own.
- Do not try over-the-counter antibiotics or herbal remedies.
What happens during a veterinary eye examination?
A comprehensive eye examination pursues the cause, not just the symptom. Tear volume is measured with the Schirmer test, the corneal surface with fluorescein staining, and intraocular pressure with tonometry; the front and back segments of the eye are then examined in detail. These tests are simple, fast, and painless, and in most cases a diagnosis can be reached in a single visit.
Are the same symptoms seen in cats?
Yes. Eye discharge, redness, and eye infections in cats arise from similar causes. Upper respiratory tract infections (especially herpesvirus) are a common cause of these complaints in cats. Just as with watery eyes in dogs, if symptoms in cats persist for more than a day or are accompanied by squinting or discharge, an examination is needed.
When should you absolutely seek care?
If redness or watering persists for more than a day, recurs, or any of the emergency signs above are present, see a veterinary ophthalmologist. In eye diseases, early diagnosis is often the only factor that saves vision.
Frequently Asked Questions
Will the redness in my dog's eye go away on its own?
Mild irritation may resolve within a few days. However, if redness persists for more than a day, recurs, or is accompanied by pain, discharge, or squinting, do not wait for it to resolve on its own — there may be an underlying disease.
Can I use over-the-counter eye drops for humans on my dog?
No. Human eye drops, especially those containing corticosteroids, can rapidly worsen corneal ulcers in dogs. The appropriate drop can only be determined after an examination and the necessary tests.
In what circumstances is eye watering an emergency?
Sudden pain, cloudiness in the cornea, eye enlargement, heavy or bloody discharge, or sudden vision loss are emergency signs. In these situations, hours matter — see a veterinary ophthalmologist without delay.
Is it normal for small-breed dogs to have constantly wet under-eyes?
Persistent tearing (epiphora) is common in some small breeds but should not be considered normal. It may have correctable causes such as a blocked tear duct or eyelid conformation; it should be evaluated with an examination.
This article is for informational purposes only and does not replace a veterinary examination. If you have any concern about your companion’s eyes, please consult a veterinary ophthalmologist.
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