A damp streak beneath a dog’s eye can look minor at first. But an eye that keeps watering, stays partly closed, becomes red or cloudy, or seems painful should be checked quickly. Before reaching for a cleaner, look at how your dog is holding the eye and whether it is rubbing its face. Comfort matters far more than the stain on the fur.
Signs that change the level of urgency
Contact a veterinary clinic right away if your dog is keeping one eye shut, blinking excessively, avoiding light, has a visible injury, or seems to see less well. A sudden change in how the eye looks also deserves prompt attention. The PDSA veterinary guidance on eye problems stresses urgent care when pain is involved.
If a household product has splashed into the eye, call immediately and name the product. Rinsing and next steps should be guided without delay. If something appears to be stuck in the eye, do not try to remove it or press on the area. If you already have a well-fitted collar available, it may help prevent rubbing while you arrange care, provided your dog tolerates it.
Tears, discharge and brown staining: three different observations
| What you see | What it may suggest |
|---|---|
| Clear tears | There may be overflow or irritation; this does not prove an allergy |
| Thick yellow or green discharge | An examination is needed; the colour does not determine the treatment |
| Brown staining under the eye | This may be tear staining and should be distinguished from bleeding |
| Eye closed, cloudy, or very red | This can indicate pain or an eye problem that needs rapid attention |
An eye that suddenly starts watering after a walk does not tell the same story as two old, stable tear marks with no discomfort. Note which side is affected and when you first noticed the change. A photo taken before cleaning can help the clinic see the discharge more clearly.
Why do dogs’ eyes water?
Possible causes include irritation, a foreign body, eyelid or eyelash problems, poor drainage of tears, and a range of eye diseases. Even dry eye can come with discharge. It would therefore be misleading to assume from a photo alone that the problem is simply conjunctivitis.
An examination may include checking for corneal damage and, depending on the signs, measuring tear production or eye pressure. That is why a drop that helped another dog may not be appropriate for yours. If you have also noticed bumping into objects or hesitating, mention these vision changes to the veterinarian as well.
Cleaning around the eye without making the irritation worse
To gently remove discharge from the fur, use a clean compress dampened with sterile saline solution, and do not rub the eye itself. If crusts have formed, soften them first rather than pulling them away. Use a fresh compress for each eye and stop if your dog shows signs of pain.
This external cleaning does not treat the underlying cause. Avoid cotton wool that can shed fibres, scented products, herbal infusions, essential oils, and contact lens solutions. Do not trim hair right up against the eye on a dog that moves around a lot; ask a professional how to manage the area safely.
Do not use an old eye drop, especially one containing a corticosteroid, unless it has been prescribed again. Instead, make a note of the product name and the opening date so you can tell the veterinarian if it has already been used. That information can help with the examination.
For dogs whose eyes water often
A chronic tear stain deserves an assessment, even when it seems mainly cosmetic. The goal is to understand why the eye is overflowing and to check comfort before focusing on whitening the fur. Keeping a reference photo from a time when everything looked normal can make a recent worsening easier to spot.
At home, reduce exposure to smoke and aerosols, keep household chemicals out of reach, and avoid letting your dog ride with its head out of the car window. Make a brief eye check part of your regular care routine, but do not clean vigorously every day by default. If there is new discharge, pain, or a change in appearance, the routine should be reviewed with the clinic.