Shih Tzus belong to a group of brachycephalic (flat-faced) breeds that experience significantly higher rates of eye problems compared to other dogs. Their distinctive appearance comes with anatomical features that make their eyes particularly vulnerable: shallow eye sockets that cause eyes to protrude, shortened tear ducts that don't drain properly, and facial folds that trap moisture and bacteria near the eyes.

The breed's large, prominent eyes sit forward in the skull with less protective bone structure around them. This means Shih Tzus have a reduced blink reflex and greater exposure to environmental irritants, scratches, and injuries. Additionally, their long facial hair constantly brushes against the cornea, creating micro-abrasions that can develop into serious infections. Veterinary ophthalmologists estimate that 60-70% of Shih Tzus will experience at least one significant eye issue during their lifetime.

Understanding these breed-specific vulnerabilities helps owners recognize problems early. The most common conditions include chronic tear staining (epiphora), corneal ulcers, keratoconjunctivitis sicca (dry eye), proptosis (eye displacement), and progressive retinal atrophy. While some issues like tear staining are primarily cosmetic, others like ulcers require immediate veterinary intervention to prevent vision loss. Regular eye examinations should be part of your Shih Tzu's routine care, especially as they age beyond seven years when degenerative conditions become more common. Similar to how certain breeds face specific health challenges, as discussed in our French Bulldog health guide, Shih Tzus require breed-aware preventive care.

Those distinctive reddish-brown streaks under your Shih Tzu's eyes aren't just a cosmetic issue—they signal that tears aren't draining properly through the nasolacrimal ducts. In Shih Tzus, these ducts are often malformed, kinked, or too narrow due to their compressed facial structure. Instead of tears flowing through the ducts into the nose and throat as intended, they overflow onto the face where they oxidize and create staining. The discoloration comes from porphyrins, iron-containing molecules in tears that turn brown when exposed to air and sunlight.

Several factors worsen tear staining in this breed: hair irritation (facial fur poking into eyes triggers excess tearing), shallow eye sockets (eyes can't fully close during blinking, leaving them constantly moist), eyelid abnormalities like entropion (inward-rolling lids) or ectropion (outward-rolling lids), ear infections (which share the same drainage system), teething in puppies (temporary inflammation of tear ducts), and dietary factors (certain proteins, additives, or minerals may increase porphyrin production). Yeast and bacterial infections thrive in the constantly damp fur, creating a musty odor and sometimes causing skin inflammation.

Effective management requires daily cleaning with veterinary-approved eye wipes or a homemade solution of filtered water with a small amount of boric acid powder. Wipe from the inner corner outward, using a fresh section of cloth for each eye. Keep facial hair trimmed short around the eyes—many Shih Tzu owners maintain a "puppy cut" specifically for eye health. Consider switching to stainless steel or ceramic food and water bowls, as plastic can harbor bacteria. Some veterinarians recommend adding a small amount of distilled white vinegar to drinking water (1 teaspoon per quart) to change tear pH, though this should only be done under veterinary guidance. For persistent staining, your vet may prescribe antibiotics like tylosin, though these are used off-label and shouldn't be a long-term solution. If tear production seems excessive or your dog shows signs of discomfort like squinting or pawing at the face, consult your veterinarian to rule out underlying conditions requiring treatment.

Corneal ulcers are one of the most painful and vision-threatening conditions Shih Tzus face. An ulcer is an open sore on the cornea (the clear outer layer of the eye) that occurs when the protective epithelial layer is damaged. In Shih Tzus, ulcers commonly develop from seemingly minor incidents: a scratch from their own facial hair, rubbing against furniture, contact with grass or plants during outdoor play, or trauma during grooming. Because their eyes protrude and have reduced corneal sensitivity, Shih Tzus may not react immediately to small injuries, allowing them to worsen before owners notice symptoms.

Watch for these warning signs: squinting or keeping the eye partially closed, excessive tearing or thick discharge, cloudiness or a visible divot on the eye surface, redness in the white of the eye, pawing at the face, sensitivity to light, or the eye appearing sunken. Ulcers require immediate veterinary attention—untreated, they can perforate through the cornea within 24-48 hours, leading to permanent vision loss or eye removal. Your veterinarian will use fluorescein stain (a special dye that makes ulcers glow green under blue light) to diagnose the ulcer and determine its depth.

Treatment typically involves antibiotic eye drops or ointment applied every 4-6 hours, pain medication, and an Elizabethan collar to prevent rubbing. Simple superficial ulcers usually heal within 5-7 days with proper treatment. However, Shih Tzus are prone to indolent ulcers (also called boxer ulcers or SCCED), which don't heal normally because the epithelial cells fail to adhere to underlying tissue. These require surgical intervention such as grid keratotomy or diamond burr debridement. Deep or infected ulcers may need more intensive treatment including hospitalization, surgical grafts, or even eye removal in severe cases. Prevention focuses on keeping facial hair trimmed away from eyes, using protective eyewear (doggles) during activities in tall grass or brush, and addressing underlying dry eye if present. Just as owners must monitor for various health concerns, similar to watching for breathing problems in dogs, vigilant observation of your Shih Tzu's eyes can catch ulcers before they become emergencies.

Keratoconjunctivitis sicca (KCS), commonly called dry eye, occurs when tear glands don't produce enough of the watery layer of tears needed to keep eyes lubricated. Shih Tzus have one of the highest breed predispositions to KCS, with studies showing they're 6-8 times more likely to develop this condition than mixed breeds. The disease can be congenital (present from birth) or develop later in life due to immune-mediated destruction of tear glands, chronic eye infections, certain medications, or aging.

Without adequate tears, the cornea and conjunctiva become inflamed, dry, and painful. Early signs include: thick, yellow-green mucus discharge (the eye tries to compensate with more mucus production), dull or lackluster eye appearance, redness and inflammation, frequent blinking or squinting, rubbing or pawing at eyes, and recurrent eye infections. Left untreated, KCS leads to corneal ulceration, scarring, pigmentation of the cornea, and eventually blindness. The condition is diagnosed through a Schirmer tear test, where a small paper strip is placed in the lower eyelid to measure tear production over one minute. Normal dogs produce 15-25mm of moisture; readings below 10mm indicate dry eye.

Treatment requires lifelong management with medications that stimulate tear production. Cyclosporine ophthalmic ointment (Optimmune) or tacrolimus are first-line treatments, applied twice daily to suppress the immune response attacking tear glands and increase natural tear production. It typically takes 4-6 weeks to see improvement, and some dogs need 2-3 months for full effect. Artificial tear supplements should be applied 4-6 times daily to provide immediate lubrication. In severe cases that don't respond to medication, surgical options include parotid duct transposition (redirecting a salivary gland duct to the eye). Prognosis is generally good with consistent treatment—most dogs regain comfortable vision and maintain quality of life. However, medication must continue for life, as stopping treatment causes symptoms to return within days. Regular monitoring with tear tests every 3-6 months helps adjust treatment as needed. Environmental modifications like using humidifiers and avoiding smoke or dusty conditions also help manage symptoms.

Proactive daily care significantly reduces the risk of serious eye problems in Shih Tzus. Establish a routine that includes gentle cleaning, careful grooming, and vigilant monitoring. Each morning, examine your dog's eyes in good lighting: they should be clear, bright, and free of discharge beyond minimal clear or slightly white matter in the inner corners. The whites of the eyes should appear white (not red or yellow), and both eyes should be the same size and shape.

For daily cleaning, use preservative-free sterile eye wash or veterinary eye wipes to gently remove any discharge or debris. Start at the inner corner and wipe outward, using a fresh wipe or cotton ball for each eye to avoid spreading bacteria. Never use human makeup remover, baby wipes with fragrance, or harsh chemicals near the eyes. Keep the hair around your Shih Tzu's eyes trimmed short—ideally, no hair should touch the eyeball. Use blunt-tipped scissors and work in good lighting, or have a professional groomer handle this delicate task. Many owners secure a topknot with a soft elastic to keep hair away from eyes between trimmings.

Environmental precautions matter too: avoid walking through tall grass or weeds where seeds and plant material can scratch eyes, rinse eyes with sterile saline after beach or dusty trail outings, keep household chemicals and cleaning products out of reach, and use pet-safe shampoos that won't irritate eyes during baths. Consider using a humidifier in dry climates or during winter when indoor heating reduces humidity. Feed a high-quality diet rich in omega-3 fatty acids, which support tear film quality and reduce inflammation. Some veterinarians recommend supplements containing lutein, zeaxanthin, and antioxidants for eye health, though scientific evidence for their effectiveness in dogs is limited.

Schedule veterinary eye exams at least annually, or every 6 months for senior Shih Tzus over age 8. Similar to how owners should track their dog's overall health milestones as discussed in our guide on when dogs become seniors, regular eye screenings help catch problems early. Seek immediate veterinary care if you notice sudden changes like cloudiness, squinting, excessive tearing, discharge, redness, visible injury, changes in eye size or position, or behavioral changes like bumping into objects. Early intervention for eye problems often means the difference between simple treatment and complex surgery or vision loss. Your Shih Tzu's prominent, expressive eyes are part of what makes the breed so endearing—protecting them requires daily attention but preserves both their vision and quality of life for years to come.