A blocked tear duct in dogs stops tears draining from the inner corner of the eye into the nose, so they overflow onto the face instead. In the UK, the tell-tale picture is one permanently wet eye, rusty staining underneath and, if the trapped fluid becomes infected, a sticky discharge that returns every time the drops run out. It is rarely an emergency, but it does need an RCVS-registered vet to find out what is causing it, because the cause decides the fix.
Many British owners first notice it after a summer of hedgerow walks, or in a flat-faced breed that has "always had weepy eyes". This page adapts our main guide to blocked tear ducts in dogs for the UK: how to tell a drainage problem from other eye trouble, how referral and pet insurance work here, and what you can safely do at home.
Is it really the tear duct? Start with the symptoms
Watering is a symptom, not a diagnosis, and a blocked tear duct in dogs is only one of several explanations. Use this table to judge how quickly you need to act, then let your vet confirm.
| Symptom | Likely cause | What to do |
|---|---|---|
| One eye always wet, clear tears, dog otherwise comfortable | Narrowed or blocked duct, or a punctum that is covered or never opened | Book a routine appointment with your vet |
| One eye, yellow-green discharge that comes back within days of stopping drops | Dacryocystitis (infected lacrimal sac), often a grass seed | See your vet within a few days and ask about a nasolacrimal flush |
| Soft, tender swelling just below the inner corner | Infected lacrimal sac or upper tooth-root abscess | Vet within 24 hours |
| Squinting, eye held shut, cloudy or red eye | Corneal ulcer, glaucoma or uveitis, not a duct problem | Same-day vet or out-of-hours service |
| Both eyes watering, itchy face and paws | Allergy, or lids rolling inward | Routine vet visit; rule out infection first |
One-sided signs point towards drainage; both eyes watering usually points elsewhere. If you are unsure whether you are looking at an infection, our checklist of warning signs of a dog eye infection will help you decide how urgent it is.
Why the drainage system fails
Tears leave the eye through two pinhole openings on the inner edge of the upper and lower lids, the puncta. They pass through short channels into the lacrimal sac, then down the nasolacrimal duct, which runs through bone to an opening inside the nostril (Hamor, Merck Veterinary Manual). A narrowing or plug anywhere along that route makes tears back up and spill over. Vets call the overflow epiphora.
Grass seeds from summer walks
This is the cause British owners least expect. Between roughly June and August, grass awns from verges, meadows and hedgerows catch in coats, ears, paws and eyes. In a Leipzig University case series, 14 dogs with one-sided dacryocystitis had been treated unsuccessfully for one to eight months; plant foreign bodies were found in every one, and the discharge resolved in all of them once the material was removed (Steinmetz et al., 2022). A stubborn one-eyed discharge that began after a summer walk deserves that history being mentioned to your vet.
Puppies born with a closed punctum
Some puppies have a lower punctum that never opened. Merck describes imperforate puncta as an infrequent but recognised cause of tearing, corrected by opening the membrane and holding it open with a temporary tube while it heals. Cocker Spaniels, Poodles and Golden Retrievers are among the breeds mentioned.
Flat faces and inward-rolling lids
French Bulldogs, Pugs, Shih Tzus and Cavalier King Charles Spaniels are some of the most popular dogs in Britain, and UK vets and welfare groups have argued for years over how extreme facial conformation affects their health. In these breeds, a tight lower lid can roll in at the inner corner and cover the punctum, while facial hair wicks tears onto the skin. It is mechanical rather than a true blockage, yet it looks the same at home. Lid problems often overlap, so read our guides to entropion in dogs and cherry eye in dogs if your dog is one of these breeds.
Teeth, nasal disease and injury
The duct runs close to the roots of the upper teeth. Merck warns that dacryocystitis can be confused with infection of the upper carnassial tooth, and a published case describes obstruction caused by a tooth growing inside the nasal cavity (Voelter-Ratson et al., 2015). Nasal tumours, facial fractures and chronic rhinitis can compress the duct too, so an older dog with new one-sided tearing needs a full work-up.
Getting care in the UK: referral, insurance and medicines
For a blocked tear duct in dogs, UK owners start with their own practice. Every vet surgeon in the UK must be registered with the Royal College of Veterinary Surgeons (RCVS), and most practices can perform a fluorescein test and a routine flush. If the duct will not clear, the problem keeps returning or imaging is needed, ask for referral to an RCVS Recognised Specialist in veterinary ophthalmology or a European College of Veterinary Ophthalmologists (ECVO) diplomate. Referral centres often have CT on site, which matters when a foreign body or nasal cause is suspected.
Pet insurance deserves a moment of thought. Signs noticed before a policy starts are usually excluded as pre-existing, so if you are about to take out cover or switch provider, have the eye examined early and make sure the findings are written in the clinical notes. Check whether your policy is lifetime cover, which typically renews the vet fee limit each year, or time-limited, which may stop paying for a condition after a set period. A recurring duct problem can run for months, so that difference counts. Costs vary widely between practices; ask for a written estimate before a flush under sedation or a referral.
Finally, veterinary medicines in the UK are regulated by the Veterinary Medicines Directorate (VMD). Human redness-relief drops are not authorised for dogs, and many contain decongestants that can harm them. Use only what your vet prescribes.
How vets diagnose a blocked tear duct in dogs
- Fluorescein passage test. A drop of orange dye goes into the eye. If it appears at the nostril after a few minutes, the duct is at least partly open. No dye does not prove a blockage, since some normal dogs drain towards the back of the throat.
- Nasolacrimal flush. A fine cannula is placed in the punctum and sterile saline is pushed gently through the duct. Resistance, or pus refluxing from the other punctum, confirms the problem. Merck describes flushing as the standard first step, often done under sedation.
- Imaging. When flushing fails or the signs come back, contrast radiographs or CT (dacryocystography) show where the duct is blocked and why.
Treatment options your vet may discuss
- Flushing plus prescription drops, sometimes guided by a culture of the flushed material.
- Foreign-body removal. In a 2024 series of 28 dogs, fine forceps passed through the upper punctum removed material without an incision in many cases; it did not work every time, but the authors suggest it can be tried before more invasive surgery (Jimenez-Ramos et al., 2024). Otherwise the sac is opened surgically.
- Opening an imperforate punctum, followed by a temporary stent.
- Temporary silicone tubing to hold a scarred duct open while it heals.
- A new drainage route (conjunctivorhinostomy) when the duct is permanently damaged.
- Treating the root cause: dental work, lid surgery or management of nasal disease.
Safe home care while you wait
You cannot unblock a duct at home. Massaging the corner or probing the punctum can push debris deeper and injure the lid. Your job is to stop the overflow causing a second problem, because constantly wet skin breeds bacteria and yeast.
- Wipe the inner corner once or twice a day with a fresh cotton pad, working from the nose outwards.
- Dry the skin fold under the eye completely after each clean.
- Ask your groomer to keep hair at the inner corner short.
- After summer walks, check the eyes, ears and paws for grass seeds.
- Avoid anything with peroxide, bleach or alcohol near the eye.
Daily eye hygiene: what to use and why
For that daily clean, we formulated our gentle daily dog eye drops for eyes that are already sore from constant tearing. Here is how they compare with a typical cosmetic tear-stain cleaner:
| Feature | Typical cosmetic tear-stain cleaner | Pure Majesty Pets eye drops |
|---|---|---|
| pH | Often not stated | 7.0–7.2, matched to natural tears |
| Grade and filtration | Cosmetic | Ophthalmic-grade, 10-micron sterile-filtered |
| Moisturising active | Usually none | Sodium hyaluronate 0.05% |
| Soothing ingredients | Rarely listed with amounts | Aloe vera 8%, chamomile 2%, pro-vitamin B5 |
| Stain control | Peroxide or bleach in some products | Sodium phytate 0.15%, a gentle mineral chelator |
| Alcohol, fragrance, bleach, peroxide | Common | None |
Be clear about what they do not do: these are non-medicated hygiene drops. They will not unblock a tear duct, treat dacryocystitis or replace anything your vet prescribes. They are the comfortable daily clean alongside treatment and, for dogs whose tearing is permanent, the part of the routine that keeps staining and sore skin in check. Made in Canada, with free worldwide shipping to the UK, so a bottle can be on your shelf before the vet appointment. Add them to your routine today, or browse our dog eye care essentials; if staining is your main worry, our tear stain remover guide explains the chemistry.
Common mistakes UK owners make
- Repeating the same antibiotic drops for months. If the discharge returns every time you stop, the source is often inside the duct. Ask for a flush.
- Forgetting the summer walk. Tell your vet if the discharge began after fields or long grass.
- Accepting weepy eyes as "normal for the breed". Flat-faced dogs still deserve an examination.
- Delaying until after the insurance starts. Undocumented signs can still be excluded later; get them assessed and recorded.
Frequently asked questions
Can a blocked tear duct in dogs clear up on its own?
Mild blockages from debris sometimes clear once an infection settles, but congenital problems, grass seeds and scarring do not. If tearing lasts more than two weeks, ask your vet to check the duct.
Will my UK pet insurance cover a blocked tear duct?
It depends on your policy. Signs noticed before cover began are usually treated as pre-existing, and time-limited policies may stop paying after a set period. Check your policy wording and have the eye assessed and documented early.
Can I flush my dog's tear duct at home?
No. Flushing needs a sterile cannula placed in the punctum, usually under sedation. At home, limit care to cleaning the eye surface and keeping the skin underneath dry.
Can I use human eye drops on my dog?
Not without your vet's advice. Human redness-relief drops are not authorised for dogs by the Veterinary Medicines Directorate and many contain decongestants that can harm them.
Scientific References
- Steinmetz A, Jara Dohmann GW, Blobner CC. Dacryocystitis in dogs caused by foreign bodies — Diagnosis and therapy in 14 cases. Veterinary Ophthalmology. 2022;25(2):180-185. PMID 34984785
- Jimenez-Ramos L, Ripolles-Garcia A, Caro-Suarez M, et al. Nasolacrimal sac foreign body extraction using vitreoretinal forceps in 28 dogs. Veterinary Ophthalmology. 2024;27(6):510-521. PMID 38414137
- Voelter-Ratson K, et al. Dacryocystitis following a nasolacrimal duct obstruction caused by an ectopic intranasal tooth in a dog. Veterinary Ophthalmology. 2015. PMID 25312093
- Hamor RE. Nasolacrimal and Lacrimal Apparatus in Animals. Merck Veterinary Manual. 2023. merckvetmanual.com
Veterinary disclaimer: This article is educational and is not a substitute for veterinary diagnosis or treatment. A suspected blocked tear duct should be examined by an RCVS-registered veterinary surgeon. Pure Majesty Pets eye drops are a non-medicated hygiene product, not a veterinary medicine authorised by the Veterinary Medicines Directorate (VMD); they do not diagnose, treat, cure or prevent disease. Free worldwide shipping.