Your dog's face is damp again. There's a rust-brown streak running from the corner of each eye, and no amount of wiping seems to make it go away for long. You're starting to wonder if this is just "how your dog is," or if something is actually wrong.

Tear duct and nasal cavity problems in dogs happen when the nasolacrimal system the tiny channel that drains tears from the eye into the nose gets blocked, never forms properly, or is overwhelmed by too many tears. This shows up as watery eyes, tear staining, or nasal discharge, and ranges from a harmless cosmetic issue to a sign of infection, a foreign object, or a structural problem that needs a vet's attention.

Key Takeaways

• Dogs drain tears through a duct that runs from the corner of the eye into the nose — when this duct is blocked, narrowed, or absent, tears overflow onto the face instead.
• The medical term for watery eyes is epiphora. It's a symptom, not a disease, and can come from either poor drainage or excess tear production.
• Rust-brown tear staining is caused by pigments called porphyrins in the tears, not dirt it's mostly cosmetic but can signal an underlying drainage problem.
• Flat-faced breeds and dogs like Cocker Spaniels are more prone to tear duct problems because of their facial structure or genetics.
• Nasal discharge, sneezing, or pawing at the face alongside watery eyes can point to rhinitis, sinusitis, or a foreign object lodged in the nose.
• Most tear duct problems are diagnosed with a simple dye test and treated with a saline flush, medicated eye drops, or in stubborn cases surgery.

What Are Tear Duct and Nasal Cavity Problems in Dogs?

Tear duct and nasal cavity problems in dogs are conditions affecting the nasolacrimal system, the drainage route that carries tears from the eye into the nasal cavity. According to the Merck Veterinary Manual, the tear gland produces the watery part of tears, and nasolacrimal ducts allow tears to drain from each eye into the nose. When any part of this pathway is blocked, malformed, or irritated, tears back up and spill over the eyelid instead of draining away quietly. Depending on the cause, this can be a simple cosmetic nuisance or a sign of an active infection, structural defect, or nasal disease that needs treatment.

These problems fall into a few broad groups: eyes that produce too many tears, ducts that can't drain the tears that are produced, and nasal conditions like rhinitis that cause discharge from the nose itself. Getting the right diagnosis matters because the treatment for each is completely different.

How Your Dog's Tear Drainage System Actually Works

Think of your dog's tear ducts like a tiny drainpipe running from each eye to the nose. Every blink pushes a fresh film of tears across the eye's surface. The excess doesn't just evaporate

it's meant to drain through two small openings (puncta) near the inner corner of each eye, down a narrow duct, and out into the nasal cavity. This is also why a good cry can make a person's nose run: the same drainage route exists in humans.

In a healthy dog, this system works so quietly you never notice it. Problems appear the moment any part of that pipe the openings, the duct itself, or the tear film balance — stops working the way it should.

Why Won't My Dog's Eyes Stop Watering? (Epiphora Explained)

Epiphora is the medical term for a dog's eyes overflowing with tears, and it happens for one of two reasons: the tears aren't draining properly, or the eye is producing far more tears than usual, usually as a reflex to irritation. According to VCA Hospitals, common signs include a constantly damp face, reddish-brown staining under the eyes, odour, and skin irritation from the moisture sitting on the fur. It's a symptom rather than a disease on its own, so the real question is always what's causing it.

Blocked or Narrowed Tear Ducts (Dacryocystitis)

When the tear sac and its attached duct get blocked by inflammatory debris, a foreign object, or a mass pressing on the duct, the result is dacryocystitis inflammation of the tear sac. The Merck Veterinary Manual notes this typically causes watering eyes, conjunctivitis that doesn't respond well to treatment, and sometimes a small draining opening in the middle of the lower eyelid. Cocker Spaniels are known to be more prone to this condition than other breeds.

Breeds Born Without a Tear Duct Opening

Some puppies are born without one of the nasal tear duct openings, a condition called imperforate lacrimal puncta. Merck describes this as an infrequent but real cause of watery eyes in young dogs. Breeds more likely to be affected include the American Cocker Spaniel, Bedlington Terrier, Golden Retriever, miniature and toy Poodle, and Samoyed. Treatment involves a vet surgically opening the blocked duct and keeping it open with a temporary tube or suture while it heals.

Flat-Faced Breeds and Physical Obstructions

Facial structure plays a big role too. VCA Hospitals explains that dogs with flat or squished-in faces brachycephalic breeds like Pugs, Shih Tzus, and Bulldogs often can't drain tears properly because the tear film simply rolls off the face before it reaches the duct opening. In other dogs, hair around the eyes physically blocks the duct entrance, or debris and foreign objects form a plug inside it.

When Watery Eyes Point to Something More Serious

Not every case of watery eyes is a cosmetic issue. If the tearing is sudden, one-sided, or comes with squinting, pawing at the face, cloudiness, or a change in eye colour, it needs a same-week vet visit rather than home management. A foreign body under the eyelid, a corneal ulcer, or glaucoma can all present with excess tearing at first, and each needs a different and sometimes urgent treatment. Persistent tear staining that suddenly appears in an older dog that never had it before is also worth a check-up, since it can point to a new obstruction rather than a lifelong breed trait.

What About Nasal Discharge? Rhinitis and Sinusitis

Because the tear duct empties into the nasal cavity, eye and nose symptoms often travel together. The Merck Veterinary Manual describes rhinitis as inflammation of the nose's mucous membranes, with signs like nasal discharge, sneezing, snoring, open-mouth breathing, or laboured breathing. Pawing at the face along with discharge from just one nostril often points to a foreign object stuck in the nose. Tears and conjunctivitis frequently accompany this kind of upper airway inflammation.

One detail worth watching for: a nasal discharge that starts on one side and gradually becomes two-sided, or changes from clear mucus to something containing blood, can suggest a tumour or fungal disease rather than simple irritation. This kind of change is a clear reason to book a vet visit rather than wait it out.

Dry Eye (Keratoconjunctivitis Sicca): The Opposite Problem

Not every eye problem in this category involves too many tears some involve too few. Keratoconjunctivitis sicca (KCS), commonly called dry eye, happens when the tear glands don't produce enough of the watery part of tears. Merck explains that this often causes a thick, persistent discharge, reddened eyes, and if left untreated slow-healing sores on the cornea. In dogs, it's frequently linked to the immune system attacking the tear-producing glands themselves. Less common causes include distemper virus, long-term use of certain sulfonamide antibiotics, heredity, and eye injury.

Treatment usually means lifelong eye medications: drops to stimulate tear production, artificial tears for moisture, and sometimes an antibiotic-corticosteroid combination if there's no damage to the cornea yet. This is a very different condition from epiphora, even though both involve the tear system, which is exactly why a proper vet diagnosis matters before you try anything at home.

How Vets Diagnose These Conditions

Diagnosis usually starts with a straightforward eye exam, checking the eyelids, the duct openings, and the cornea for scratches or ulcers. One of the simplest tests, described by VCA Hospitals, involves placing a drop of fluorescein dye in the eye and watching to see if it appears at the nostril or in the mouth within a few minutes if it doesn't show up, a blockage is likely. For chronic or unexplained cases, vets may take X-rays after injecting a special dye into the duct, a technique that maps out exactly where a blockage sits.

Treatment: From a Simple Flush to Surgery

Treatment depends entirely on the underlying cause. For a suspected blockage, the first step is usually flushing the duct with sterile water or saline to clear debris. If that doesn't resolve it, your vet may recommend antibiotic eye drops to control secondary infection while the duct heals. When the tear duct has been permanently damaged and can't be reopened, Merck notes that surgery can create a new drainage pathway so tears empty into the nasal cavity, sinus, or mouth instead. For imperforate puncta in puppies, surgical opening of the duct followed by a temporary tube or suture is standard care.

Whatever the treatment plan, it should come from your vet after an exam not guesswork at home, since the wrong approach can mask a more serious problem like a corneal ulcer.

Caring for Your Dog's Eyes at Home

Once your vet has ruled out anything urgent, some simple home habits make a real difference between visits:

• Wipe the area under the eyes daily with a clean, damp cloth to stop moisture and bacteria from building up on the fur.
• Keep the hair around your dog's eyes trimmed short if your breed has long facial fur, so it doesn't trap debris against the duct opening.
• Never use human eye drops, hydrogen peroxide, or over-the-counter "tear stain removers" without checking with your vet first — some of these can irritate or damage the eye.
• If your vet has prescribed eye drops, use them exactly as directed and finish the full course, even if the eye looks better after a couple of days.
• Book a vet visit promptly if you notice sudden squinting, one-sided tearing, cloudiness, or a change in how much your dog paws at their face.

FAQ

Why does my dog have brown stains under their eyes?
Brown or rust-coloured tear stains come from porphyrins, natural pigments present in tears that darken when exposed to air. They're usually cosmetic in dogs with light-coloured fur, but if the staining is new or accompanied by odour, redness, or thick discharge, it's worth having a vet check for an underlying drainage problem.

Is watery eye an emergency in dogs?
Not usually, but sudden, one-sided tearing with squinting, pawing at the face, or cloudiness in the eye should be seen by a vet quickly, since it can point to a foreign object, corneal ulcer, or glaucoma rather than a simple drainage issue.

Can puppies be born with tear duct problems?
Yes. Imperforate lacrimal puncta, where the nasal tear duct opening never formed, is an infrequent but recognised cause of watery eyes in young dogs, especially in breeds like Cocker Spaniels and Golden Retrievers. It's corrected with a straightforward surgical procedure.

Will my dog need surgery for a blocked tear duct?
Not always. Many blockages respond to a simple saline flush and antibiotic drops. Surgery is generally reserved for ducts that are permanently scarred or damaged and can't be reopened by flushing alone.

Do flat-faced dog breeds always have tear staining?
Many do, because their facial structure means tears roll off the face instead of draining into the duct properly. It's a known breed trait in dogs like Pugs, Shih Tzus, and Bulldogs, but persistent redness, odour, or thick discharge on top of the staining still deserves a vet check.

References

• Gelatt, K. N. Disorders of the Nasal Cavity and Tear Ducts in Dogs. Merck Veterinary Manual (Pet Owner Version). https://www.merckvetmanual.com/dog-owners/eye-disorders-of-dogs/disorders-of-the-nasal-cavity-and-tear-ducts-in-dogs
• Nasolacrimal and Lacrimal Apparatus in Animals. Merck Veterinary Manual (Professional Version). https://www.merckvetmanual.com/eye-diseases-and-disorders/ophthalmology/nasolacrimal-and-lacrimal-apparatus-in-animals
• Rhinitis and Sinusitis in Dogs. Merck Veterinary Manual (Pet Owner Version). https://www.merckvetmanual.com/dog-owners/lung-and-airway-disorders-of-dogs/rhinitis-and-sinusitis-in-dogs
• Eye Discharge (Epiphora) in Dogs. VCA Animal Hospitals. https://vcahospitals.com/know-your-pet/eye-discharge-or-epiphora-in-dogs
• Lacrimal Duct Obstruction in Dogs. VCA Animal Hospitals. https://vcahospitals.com/know-your-pet/lacrimal-duct-obstruction-in-dogs