Cataracts in Shih Tzus
Shih Tzus can develop cataracts, where the lens of the eye becomes progressively opaque. Hereditary cataracts are documented in the breed and may appear at a younger age than age-related cataracts. Shih Tzus benefit from annual eye examinations and early referral to a veterinary ophthalmologist if cloudiness is detected.
Prevalence
Documented breed predisposition
Typical Onset
2-6 years (hereditary) or 8+ years (age-related)
Severity
Moderate
Symptoms to Watch For
If your Shih Tzu shows any of these signs, monitor closely and consult your veterinarian.
Risk Factors
- •hereditary predisposition
- •diabetes mellitus (causes rapid cataract formation)
- •retinal degeneration (PRA)
- •trauma to the eye
- •nutritional deficiencies in early life
Diagnosis
Ophthalmic examination with slit lamp biomicroscopy reveals lens opacity location, extent, and maturity (incipient, immature, mature, hypermature). Electroretinogram (ERG) confirms retinal function before surgery. Ocular ultrasound if mature cataract prevents retinal visualization. Genetic testing available for hereditary cataracts in some breeds.
Treatment
Phacoemulsification (ultrasonic lens fragmentation and removal) with artificial lens implantation is the standard surgical treatment with 90-95% success rate. Anti-inflammatory eye drops are used long-term post-surgery. Non-surgical management: monitor for lens-induced uveitis, manage with topical anti-inflammatories. Diabetic cataracts progress rapidly and benefit from early surgery.
Prevention
CERF/OFA eye examinations for breeding stock. Annual ophthalmologic exams for predisposed breeds. Control diabetes promptly if diagnosed. Protect eyes from UV with dog-specific goggles for high-altitude or snow activities. Antioxidant supplementation may slow age-related changes.
When to See a Vet
See your vet if you notice cloudiness in your pet's eyes or changes in their confidence navigating. Early cataracts are treatable with surgery before they mature. If your pet is diabetic and develops sudden cloudiness, seek urgent ophthalmologic evaluation.
Other Health Conditions in Shih Tzus
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