Dog Constant Blinking and Light Sensitivity: Causes and Triage

TL;DR: Squinting and light sensitivity in dogs indicate eye pain and require a veterinary evaluation within 24 hours to prevent permanent vision loss. Common causes range from minor scratches to serious conditions like glaucoma.

What causes my dog to blink constantly and be sensitive to light?

When your dog is constantly blinking or squinting, it is medically referred to as blepharospasm. This is often accompanied by photophobia, or sensitivity to light. These behaviors are involuntary muscle spasms and reactions indicating that your dog is experiencing ocular pain. Common causes include:

• Corneal ulcers (scratches on the eye)
• Foreign bodies like seeds or dust
• Eye infections
• Serious internal issues like uveitis or glaucoma

Is my dog's squinting and light sensitivity a veterinary emergency?

The urgency level for constant blinking and light sensitivity is Medium. While these symptoms are rarely immediately life-threatening, eye conditions in dogs can progress very quickly, sometimes leading to permanent vision loss within 24 to 48 hours. You should schedule a veterinary appointment for the same day or visit an urgent care clinic if you notice:

• The eye appears cloudy or hazy
• The eye is bloodshot or significantly red
• Your dog is pawing at their face or the affected eye

How can taking a photo of my dog's eye help the veterinarian?

Taking a clear, well-lit photo of your dog's eye can be a vital tool for triage. A photo helps your vet by:

• Allowing a professional to see the exact position of the eyelids and the presence of any discharge without causing further stress.
• Providing a baseline to determine if the redness or condition is worsening while you wait for your appointment.
• Capturing the eye's appearance in natural light (avoid using a high-intensity flash, which may cause your dog discomfort).