Dog Tear Stains and Eye Discharge: Causes and Safe Care
Tear stains are the reddish-brown marks that can appear beneath a dog's eyes, especially on light-coloured coats. They are often cosmetic, but new or persistent staining can also accompany excessive tearing, poor tear drainage, eyelid or eyelash problems, eye irritation, infection, or dry eye. The safest approach is to look at the eye itself—not just the colour of the fur.
Quick safety note: Contact a veterinarian promptly if your dog is squinting, holding an eye closed, pawing at the face, showing redness or swelling, has a cloudy or injured-looking eye, or develops thick yellow, green, bloody, or foul-smelling discharge. Eye pain and corneal injuries can worsen quickly.
Tear Stains and Eye Discharge Are Not the Same Thing
Normal tears protect the eye and usually drain through small openings into the nasolacrimal ducts. When tears spill onto the face instead, the condition is called epiphora. Repeated wetting can discolour the fur and irritate the skin. Facial anatomy and hair near the inner corner of the eye can make overflow more noticeable in some dogs.
Eye discharge describes material coming from the eye. A small amount of clear or lightly coloured residue after sleep can occur, but thick mucus, pus-like discharge, persistent wetness, redness, or discomfort deserves veterinary attention. Dry eye can produce thick discharge rather than an obviously dry-looking eye, and tear-duct obstruction can cause ongoing overflow.
Common Causes a Veterinarian May Consider
- Facial anatomy or hair around the eyes: Hair may redirect tears onto the face or rub the surface of the eye.
- Poor tear drainage: A narrow, inflamed, obstructed, or incompletely formed tear duct can lead to overflow.
- Eyelid or eyelash abnormalities: Inward-rolling eyelids or misdirected lashes may irritate the cornea and increase tearing.
- Surface irritation or injury: Dust, plant material, shampoo, scratches, and corneal ulcers can cause tearing, blinking, and pain.
- Conjunctivitis or other inflammation: Redness and discharge can have several causes and should not be treated by guessing.
- Dry eye: Reduced tear production can cause redness, discomfort, a dull-looking eye, and thick discharge. It often requires long-term veterinary treatment.
Diet should not be blamed automatically. There is no sound basis for describing tear stains as internal “heat,” and chrysanthemum water, mung bean soup, salt restriction, or an unselected supplement is not a treatment for an eye disorder. Feed a complete diet and provide fresh water for general health, but let an eye examination guide treatment.
How to Clean the Fur Around the Eyes Safely
- Wash your hands and use a separate clean, soft cloth or pad for each eye.
- Moisten the cloth with lukewarm water and gently soften dried material on the fur. Do not scrub the eyelid or eye surface.
- Wipe away from the eye, then pat the surrounding fur dry. Keeping persistently wet skin clean and dry may reduce irritation.
- If hair repeatedly touches the eye, ask a groomer or veterinary professional to trim it safely. Do not point scissors toward a moving dog's eye.
- Clean bowls, bedding, and grooming tools regularly, and watch whether the discharge returns quickly.
For broader face and coat hygiene, use the gentle handling principles in our guide to safe, low-stress dog bathing. Owners of light-coated small dogs may also find the grooming context in our Bichon Frise care overview useful, but breed appearance should never replace an eye-health assessment.
What Not to Put Near Your Dog's Eyes
- Do not use hydrogen peroxide, vinegar, essential oils, stain removers, or household cleaners near the eyes.
- Do not use human redness-relief drops, leftover antibiotics, steroid drops, or another pet's medication.
- Do not start an eye wash, lubricant, supplement, or medicated wipe because of an online recommendation alone. Ask your veterinarian whether the product is appropriate and where it should be applied.
- Do not forcefully flush an eye with a suspected injury or embedded object. Seek veterinary help.
Some eye medications can delay healing or worsen specific conditions. “Pet-safe” on a label does not mean a product is right for every cause of discharge.
What a Veterinary Eye Exam May Involve
Your veterinarian may examine the eyelids, lashes, conjunctiva, cornea, and tear-duct openings. Depending on the signs, testing can include a Schirmer tear test to measure tear production, fluorescein dye to look for corneal damage or assess drainage, eye-pressure measurement, or gentle tear-duct flushing. Treatment then targets the cause rather than the stain itself.
A blocked duct, abnormal eyelash, dry eye, ulcer, infection, allergy, or eyelid problem requires a different plan. This is why a universal tear-stain supplement or diet change cannot replace diagnosis.
Frequently Asked Questions
Are tear stains always a medical problem?
No. In some dogs they are mainly cosmetic and related to facial anatomy or tear drainage. New, one-sided, worsening, painful, smelly, or inflamed changes should still be checked.
Can food cause tear stains?
A complete diet and fresh water support general health, but tear stains should not automatically be attributed to salt, oil, “internal heat,” or a nutrient deficiency. Persistent tearing needs an eye-focused assessment.
Can I use human eye drops?
Not unless a veterinarian has specifically instructed you to use that exact product. Human eye products vary, and some ingredients or preservatives are inappropriate for a dog's condition.
How often should I wipe the area?
Gently clean visible residue as needed, often once or twice daily for a dog with regular overflow. Stop if cleaning causes pain, and arrange an exam if wetness or discharge keeps returning.
When is eye discharge an emergency?
Seek urgent veterinary care for severe pain, sudden squinting, a closed eye, trauma, chemical exposure, a cloudy or blue-looking cornea, sudden vision change, marked swelling, or blood. Thick coloured discharge with discomfort also needs prompt attention.
Sources and Further Guidance
- Merck Veterinary Manual: Tear duct disorders in dogs
- Merck Veterinary Manual: Nasolacrimal and lacrimal apparatus
- Cornell University College of Veterinary Medicine: Dry eye in dogs
This article provides general educational information and does not replace an examination or treatment plan from your veterinarian.