Yes, dogs can get clogged tear ducts, and it’s a relatively common eye problem. The medical term is nasolacrimal duct obstruction, and it can happen in any breed, though certain dogs are far more prone to it because of their skull shape. A blockage prevents tears from draining normally, causing them to overflow down the face instead of emptying into the nasal cavity.
How Tear Drainage Works in Dogs
A dog’s tear drainage system works much like a human’s. Tears collect at tiny openings called puncta, located at the inner corners of the eyelids. From there, they flow through small channels into a tear sac, then down through a narrow duct that empties into the nasal cavity. This is why a dog with healthy tear ducts will sometimes have a slightly moist nose: tears are constantly trickling down into it.
Every time your dog blinks, a small muscle around the eye squeezes to pump tears through this system. Valves along the pathway keep fluid moving in one direction. When any part of this system gets blocked, whether by inflammation, debris, infection, or a structural abnormality, tears have nowhere to go and spill over onto the face.
Why Flat-Faced Breeds Are Most Affected
Brachycephalic breeds like Pugs, French Bulldogs, and English Bulldogs have dramatically altered tear drainage anatomy. A CT study comparing these breeds to dogs with normal skull shapes found that their entire drainage system is grossly malformed as a direct consequence of breeding for a shortened head.
Several specific differences make blockages more likely in these dogs. Their tear channels are two to three times longer than normal, running in the opposite direction from what’s typical. The tear sac, which normally has a distinct drop shape, is so small and compressed in flat-faced dogs that it’s often hard to identify on imaging. The duct itself is half the length of a normal dog’s but follows a path that’s three to five times steeper. In Pugs and French Bulldogs, the duct has to cross beneath the root of the upper canine tooth to reach the nasal cavity, creating an additional pinch point.
The overall angle of the drainage system tells the story clearly. In dogs with normal skulls, the system bends at a gentle, obtuse angle of about 112 degrees. In Pugs, that angle compresses to roughly 60 degrees. French Bulldogs and English Bulldogs fall around 80 to 84 degrees. These sharp turns make it much harder for tears to flow freely, and much easier for the system to clog.
Signs of a Clogged Tear Duct
The most obvious sign is persistent watering from one or both eyes, often leaving wet tracks or reddish-brown staining on the fur below the eye. In light-colored dogs, this staining is especially noticeable. You might also see:
- Mucus or pus at the inner eye corner, which can range from clear and watery to thick and yellowish-green
- Redness or swelling near the inner eyelid, particularly if the tear sac itself becomes inflamed
- Conjunctivitis that keeps coming back despite treatment, especially if it only affects one eye
- Irritated or infected skin beneath the eye from constant moisture, sometimes with a noticeable smell
In some cases, the tear sac can become infected (a condition called dacryocystitis), causing pain when you touch the area near the inner corner of the eye. If this infection goes untreated, the tear sac can abscess and eventually rupture through the skin.
What Causes the Blockage
Breed-related anatomy is the most common underlying factor, but several other things can trigger or worsen a blockage. Infections, whether bacterial or fungal, can cause swelling inside the duct that narrows or closes it off. Trauma to the face or eye area can damage the duct. Foreign material like grass seeds or debris can physically obstruct it. Dental disease, particularly involving the upper teeth, can put pressure on the duct where it passes near the tooth roots.
Some puppies are born with an incomplete opening at one or both ends of the duct, a condition called imperforate punctum. This is an infrequent cause of watery eyes in young dogs but worth investigating if a puppy has persistent tearing from an early age.
How Vets Diagnose the Problem
Diagnosis typically starts with a fluorescein dye test. Your vet places a drop of bright green fluorescein dye in your dog’s eye and watches to see if it appears at the nostril within a set timeframe. In dogs with normal skull shapes, a single drop should clear within about 60 minutes. If the dye doesn’t appear at the nose or takes significantly longer, the duct is likely blocked.
Your vet will also examine the eye under magnification to check whether the punctal openings are visible and normal-looking. If a more detailed view is needed, contrast imaging (where dye is injected into the duct and then viewed on CT) can pinpoint exactly where the obstruction is. This cross-sectional imaging provides much better resolution of the narrow, bony canal than standard X-rays.
Treatment Options
The first-line treatment for most blockages is a duct flush. While your dog is sedated, the vet inserts a very thin tube (called a cannula) into the punctal opening at the eye and pushes sterile saline through the duct. This is often enough to clear mild obstructions like mucus plugs or debris. It also helps the vet determine how severe the blockage is: if fluid flows through easily, the obstruction was minor, but if it can’t pass at all, something more significant is going on.
When infection is involved, antibiotics are typically needed alongside the flush. However, medical management alone often controls the secondary infection without permanently clearing the obstruction itself. Chronic or recurring blockages may need repeated flushes or more advanced intervention.
For dogs born without a duct opening, or those with severe scarring or structural problems that prevent the duct from functioning, surgical options exist to create or widen the drainage pathway. The specific approach depends on where the problem is located and how the dog’s anatomy is shaped.
Managing Tear Stains at Home
For dogs whose tear ducts work partially but overflow due to their facial structure, daily maintenance helps keep the area clean and prevents skin problems. Pet-friendly eye wipes work well for routine cleanup. You can also use a warm, damp washcloth with a small amount of baby shampoo to gently clean the stained fur around the eyes.
The key rule: don’t put any drops, washes, or cleansers directly into your dog’s eyes unless a vet has specifically recommended them. Focus your cleaning on the fur and skin below and around the eye, not the eye itself. If the skin under the stained area looks red, swollen, or has a bad smell, that suggests a secondary skin infection that needs treatment rather than just cleaning.
For flat-faced breeds prone to chronic overflow, you can’t fully prevent tears from spilling down the face, but keeping the area dry and clean reduces staining and lowers the risk of skin irritation turning into something worse.