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Canine Nasolacrimal Duct Obstruction FAQ — Key Points Pet Owners Must Know

Eye HealthQ&AMeongsiljang Veterinary Advisory Board

Canine nasolacrimal duct obstruction occurs when tears cannot drain properly, causing the area around the eyes to become wet and stained. Here’s a summary of the key questions and solutions pet owners should know.

Nasolacrimal Duct Obstruction in Dogs Is a Condition Where Tears Cannot Drain Properly

A dog with tear stains around the eyes due to blocked tear ducts

Nasolacrimal duct obstruction in dogs occurs when tears cannot drain properly through the nasolacrimal duct, causing the area around the eyes to become moist and stained. - Nasolacrimal duct obstruction: This condition arises when the tear drainage pathway becomes narrowed or blocked. It is commonly seen in small breeds with excessive hair in the inner corners of the eyes and in brachycephalic breeds with protruding eyes. - Genetic factors: Some breeds are predisposed to congenital narrowing or malformation of part of the nasolacrimal duct, making tear drainage difficult from an early age. - Inflammation and foreign bodies: Inflammation around the eyes or adjacent areas can spread to the nasolacrimal duct, or foreign bodies may become lodged, blocking the passage. - Bacterial infection and tumors: Bacterial infections or, rarely, tumors can also obstruct the nasolacrimal duct. If symptoms appear, seek veterinary care immediately.

Identify the Main Causes of Nasolacrimal Duct Obstruction

There are many possible causes of nasolacrimal duct obstruction. - Blocked nasolacrimal duct: The tear-draining passage can become obstructed by hair or inflammation. - Eyelid abnormalities: Entropion, in which the eyelid rolls inward, irritates the eye and interferes with tear drainage. - Hair around the eyes: Long hair in the inner corner of the eye can pull the tear film toward the skin, leading to tear staining and related issues. - Inflammatory response: Inflammation inside the nasolacrimal duct can prevent tears from draining properly. - Foreign bodies and bacterial infections: Foreign material lodged in the nasolacrimal duct or bacterial infections can cause the passage to become blocked or narrowed. Early diagnosis and treatment are essential.

Anatomy of a dog’s tear ducts and nasolacrimal ducts

Check the 5 Main Symptoms of Nasolacrimal Duct Obstruction

The most common sign of a blocked tear duct is moisture and staining around the eyes. - Tear staining: The fur around the eyes often turns brown. - Skin reactions: The skin around the eyes may become red, flaky, and itchy. - Persistent tearing: Tears continuously flow from the eyes. - Redness and irritation: The eyes may appear red, and your pet may frequently rub them. - Increased risk of infection: Prolonged moisture can lead to bacterial infections. If symptoms persist for more than a week, a veterinary examination is essential.

Immediate Veterinary Visit Is Necessary If Tear Stains Appear

If tear stains appear and persist for more than a week, the risk of infection increases. In particular, if the skin around the eyes becomes flaky or red, you should seek veterinary care immediately. Ignoring the issue can lead to eye inflammation or complete blockage of the nasolacrimal duct. Early diagnosis and treatment are crucial, so please visit a clinic promptly if you notice any symptoms.

Comparison of Mild, Moderate, and Severe Symptoms of Nasolacrimal Duct Obstruction

Item	Mild	Moderate	Severe
Tear Stains	Slight wet marks	Persistent tear stains	Severe staining, fur discoloration
Skin Reaction	None	Mild redness	Inflammation, peeling, ulceration
Behavioral Changes	None	Rubbing the eyes	Squinting, anxiety
Treatment Necessity	Observation	Medical treatment	Surgery required

If symptoms worsen, surgical treatment may be necessary. Early intervention is important.

4 Home Care Measures You Can Take

While veterinary treatment is essential for nasolacrimal duct obstruction, there are also home care measures you can take. - Keep the area around the eyes clean: Gently wipe around the eyes 1–2 times daily with a soft cloth. - Grooming: For long-haired breeds, it is advisable to regularly trim the hair around the eyes short. - Use of antibiotic ointment: You may apply ointment to prevent infection, following your veterinarian’s instructions. - Prevent irritation of the nasolacrimal duct: Check the structures around the eyes to ensure proper tear drainage and minimize irritation. Consistent care is key.

A guardian gently wiping away tear stains from their puppy’s eyes

5 Daily Habits for Prevention

Preventing tear duct obstruction in dogs hinges on consistent daily care. - Make daily cleaning a habit: Gently wipe the area around your dog’s eyes every day with a soft cloth. - Regular grooming: For long-haired breeds, it’s best to keep the hair around the eyes trimmed short every 2–3 weeks. - Maintain cleanliness to prevent infection: Always keep the area around the eyes dry and clean. - Regular veterinary check-ups: Have your veterinarian examine your dog’s eyes every six months. - Early detection: If you notice tear stains, seek veterinary care immediately. Prevention is far more effective than treatment.

Certain Breeds Are at Higher Risk for Nasolacrimal Duct Obstruction

Small breeds like Poodles and brachycephalic breeds with short muzzles, such as Pugs, are at higher risk for tear duct obstruction and tear staining. Small dogs often have excessive hair in the inner corners of their eyes, which can wick tears onto the skin, while brachycephalic breeds may have inward-rolling eyelids or curved nasolacrimal ducts that impede proper tear drainage. Regular grooming and veterinary check-ups are essential for these breeds, and any symptoms should be addressed promptly.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

5 Frequently Asked Questions

Does tear staining always mean I need to visit the vet?

If tear stains persist for more than a week, the risk of infection increases. You should seek veterinary care immediately.

Can a blocked tear duct be corrected with surgery?

In severe cases, the bile duct can be reopened or surgically corrected. The veterinarian will determine the best course of action based on the specific situation.

How can I clean tear stains at home?

Gently wipe around your pet’s eyes with a soft cloth or sponge. Use only water and avoid any irritating products.

Is nasolacrimal duct obstruction genetically inherited?

Certain breeds are more prone to tear duct blockages due to their genetic makeup. Long-haired breeds, in particular, require extra attention.

Should I change my pet’s food if tear stains appear?

Tear stains are primarily caused by structural issues in the eyes and have little direct connection to diet. However, since allergies could also be a factor, please consult with your veterinarian.

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References

[1] Gelatt KN et al. (2013). Veterinary Ophthalmology, 2nd ed. Wiley-Blackwell, Oxford, UK.

[2] Esson DW and Calvarese S (2022). Clinical Atlas of Canine and Feline Ophthalmic Disease, 2nd ed. John Wiley & Sons, Inc.

[3] Ny Y et al. (2006). Medial canthoplasty for epiphora in dogs: a retrospective study of 23 cases. J Am Anim Hosp Assoc, 42, 435–439.