SQUINTING (BLEPHAROSPASM) IN DOGS/CATS
WHAT THIS SYMPTOM USUALLY MEANS
Squinting indicates pain. Pets squint when the eye is irritated, inflamed, ulcerated, or when light sensitivity is present. Squinting is one of the most reliable signs of significant eye disease and should never be ignored.
MOST COMMON CAUSES
MILD OR SELF-LIMITING CAUSES (COMMON)
• Minor debris or dust irritation
• Mild conjunctivitis
• Temporary dryness
• Allergic irritation
• Eyelid hair rubbing the eye
MEDICAL CAUSES THAT NEED DIAGNOSIS (MODERATE CONCERN)
• Corneal ulcer
• Foreign body under eyelid
• Uveitis
• Eyelid abnormalities (entropion/ectropion)
• Dry eye causing corneal irritation
• Viral conjunctivitis (cats)
EMERGENCY CAUSES (HIGH CONCERN)
• Glaucoma
• Deep or rapidly progressing corneal ulcer
• Penetrating eye injury
• Chemical exposure
• Sudden onset squinting + cloudiness
RED FLAGS: WHEN THIS IS AN EMERGENCY
• Squinting + pawing at the eye
• Squinting + cloudiness
• Squinting after trauma
• Squinting + discharge or blood
• Light sensitivity
If you’re unsure, treat it as urgent.
AT-HOME CARE YOU CAN START NOW
• Use a cone to prevent rubbing.
• Gently flush with sterile saline only.
• Keep your pet in dim indoor lighting.
• Do not use steroid drops—dangerous if ulcer is present.
These steps do not replace a veterinary exam if symptoms continue or worsen.
WHAT A VETERINARIAN WILL CHECK
• Corneal staining for ulcers
• Eye pressure testing for glaucoma
• Eyelid exam for abnormalities
• Full slit-lamp eye evaluation
• Tear production test
• Pain control + appropriate medication based on cause
MOST LIKELY DIAGNOSES (BASED ON 40 YEARS OF CASES)
• Corneal ulcer
• Uveitis
• Conjunctivitis
• Glaucoma
• Eyelid abnormalities
• Dry eye
• Foreign body
BREEDS OR AGES AT HIGHER RISK
• Brachycephalics — high corneal injury risk
• Spaniels — dry eye
• Shepherds — immune-mediated uveitis
• Cats — viral conjunctivitis
• Seniors — glaucoma risk
WHEN YOU SHOULD SCHEDULE A VETERINARY VISIT
- Today: any squinting that persists more than 1–2 hours
- 48 hours: mild squinting that is improving
- 1 week: mild conjunctivitis without pain
- Monitor: very brief irritation after wind exposure
EXPECTED RECOVERY TIME
• Minor irritation: hours–days
• Ulcers: 1–3 weeks
• Uveitis: depends on cause
• Glaucoma: requires immediate and ongoing care
HOW THIS SYMPTOM RELATES TO LONGEVITY
Squinting often signals painful, vision-threatening disease. Protecting eye health maintains independence, confidence, and cognitive function in aging pets.
WHEN TO CONSIDER A LONGEVITY CONSULT
Ideal for pets with chronic eye irritation, autoimmune eye conditions, or age-related ocular disease.
FOR CANCER-RELATED CONCERNS
Squinting due to uveitis can sometimes reflect internal tumors. Visit Pet Cancer Navigator if the cause is unclear.
FAQ
Why does my pet squint more in sunlight?
Light sensitivity often means corneal injury or uveitis.
Is squinting always painful?
Almost always—assume pain until proven otherwise.
Can stress cause squinting?
Not directly—usually something is physically irritating the eye.