--- title: "Dog Eye Discharge" description: "Clear tear overflow differs from thick yellow-green pus in dogs. Squinting, redness, or cloudiness need same-day vet care." url: "https://pethealth.org.uk/health/dog-eye-discharge" canonical: "https://pethealth.org.uk/health/dog-eye-discharge" date_published: "2026-06-25" date_modified: "2026-06-25" source: "PETHEALTH+" --- # Dog Eye Discharge **Small amounts of clear discharge** are often normal — especially in windy weather or dusty walks. **Thick yellow or green discharge, squinting, redness, cloudiness, or pawing at the eye** needs a vet — often infection, dry eye, or a corneal ulcer. Eye injuries progress quickly and should not wait. ## Normal discharge vs illness A trace of clear moisture in the corner of the eye, especially after sleep, is common. Dogs with prominent eyes or blocked tear ducts may have **tear staining** on the fur below the eye — this is cosmetic unless the eye looks sore. **Usually harmless:** - Clear, watery discharge after windy walks or dust - Slight crusting after sleep that wipes away easily - Tear staining in flat-faced breeds without redness or squinting **Needs investigation:** - **Yellow, green, or bloody** discharge - **Squinting** or keeping the eye closed - **Redness** of the white of the eye or inner eyelids - **Cloudy, blue, or scratched** appearance on the cornea - **Swollen eyelids** or a bulging eye - Discharge with [sneezing](/health/why-is-my-dog-sneezing) or [allergic itching](/health/dog-allergies-and-itching) ## Common causes in UK dogs | Cause | Typical signs | Notes | |-------|---------------|-------| | **Allergies and irritants** | Clear discharge, rubbing face, seasonal pattern | May overlap with [dog allergies](/health/dog-allergies-and-itching) | | **Conjunctivitis** | Red eye, mucoid or pus discharge | Bacterial or viral — vet drops needed | | **Dry eye (KCS)** | Thick mucoid discharge, dull cornea | Common in some breeds — lifelong treatment | | **Blocked tear ducts** | Constant wetness, tear staining | More common in flat-faced breeds | | **Corneal ulcer** | Squinting, watery or cloudy eye | Painful — same-day vet care | | **Foreign body** | Sudden squinting, pawing | Grass seeds, dust, or hair under eyelid | | **Glaucoma** | Red, painful, enlarged eye | Emergency — vision and eye at risk | ### Breed and age factors Flat-faced breeds are prone to **exposure keratitis** and ulcers because their eyes protrude. Senior dogs may develop dry eye or age-related eye disease. Working dogs in long grass need extra attention after walks. ## When to see a vet urgently Phone your vet **the same day** or use **emergency out-of-hours care** if: - Your dog is **squinting** or will not open the eye - The eye looks **cloudy, blue, or scratched** - **Sudden blindness** or bumping into furniture - **Bulging or very swollen** eye - Discharge after **trauma** — scratch, fight, or chemical splash - **Blood** in or around the eye - Discharge with **lethargy, fever, or not eating** Book a **routine appointment within a few days** for mild discharge that persists more than 48 hours without squinting. ## Home care before your appointment While waiting for a vet visit, note: - **Which eye** is affected — photograph discharge colour if safe - **When** symptoms started and whether they are worsening - **Recent walks** — long grass, foxholes, or dusty areas - **Other symptoms** — [sneezing](/health/why-is-my-dog-sneezing), [bad breath](/health/dog-bad-breath-causes), or [pale gums](/health/dog-pale-gums) **What you can do at home:** - Gently wipe clear discharge with **cooled boiled water** — one cloth per eye - Prevent your dog **pawing or rubbing** the eye — use a cone if advised - Keep the area **clean and dry** - Use a **lead** on walks to avoid further injury **What not to do:** - Do not use **human eye drops** without vet advice — some worsen ulcers - Do not poke **cotton buds** into the eye or under the eyelid - Do not delay if your dog is **squinting or the eye looks cloudy** ## What your vet may do Examination may include checking the cornea with a stain, measuring tear production, and assessing pressure inside the eye. Your vet might recommend: - **Antibiotic or anti-inflammatory drops** for infection or inflammation - **Artificial tears or immunosuppressive drops** for dry eye - **Foreign body removal** under sedation if needed - **Referral to a specialist** for glaucoma, deep ulcers, or surgery Treatment depends on cause — ulcers need prompt care; dry eye usually needs lifelong management. See [Dog dental care UK](/health/dog-dental-care-uk) if dental disease is suspected as a contributing factor. ## Related guides - [Why is my dog sneezing?](/health/why-is-my-dog-sneezing) - [Dog allergies and itching](/health/dog-allergies-and-itching) - [Dog bad breath causes](/health/dog-bad-breath-causes) - [Dog pale gums](/health/dog-pale-gums) - [Dog dental care UK](/health/dog-dental-care-uk) ## FAQs ### Is eye discharge always an infection? No — allergies, blocked tear ducts, dry eye, and irritants cause discharge without infection. Thick yellow or green pus, squinting, or a painful eye usually needs vet treatment. ### Can I clean my dog's eyes at home? Yes — use cooled boiled water or vet-approved wipes, one clean cloth per eye. Wipe from the inner corner outward. Do not use human eye drops unless your vet advises them. ### When is eye discharge an emergency? Squinting, a bulging eye, sudden blindness, a cloudy or blue cornea, or discharge after trauma needs same-day or emergency care. Eye problems can worsen within hours. ### Do flat-faced breeds get more eye problems? Yes — brachycephalic breeds such as French Bulldogs and Pugs have shallow eye sockets and more tear staining. They are also prone to corneal ulcers and need careful monitoring. ## Sources - [PDSA — Dog health advice](https://www.pdsa.org.uk/pet-help-and-advice/pet-health-hub) - [Blue Cross — Dog health and injuries](https://www.bluecross.org.uk/pet-advice) - [RSPCA — Dogs](https://www.rspca.org.uk/adviceandwelfare/pets/dogs) Canonical HTML: https://pethealth.org.uk/health/dog-eye-discharge Last modified: 2026-06-25