Have you noticed your dog’s eyes looking unusually red? Whether it’s a subtle pink hue or a glaring redness, eye discoloration can signal a range of underlying conditions in dogs. Some are harmless and temporary, while others require prompt veterinary attention.
Knowing the potential reasons behind red eyes in dogs can help you decide whether it’s time to schedule a vet visit or simply monitor at home. Below, we’ll explore the most common causes of canine eye redness and what steps you should take if you notice symptoms.
6 Common Causes of Red Eyes in Dogs
Uveitis
Uveitis refers to inflammation within the eye, particularly affecting the uvea—the middle layer of the eye. This condition can be painful and is sometimes linked to infections, immune disorders, or trauma. Dogs with prominent or protruding eyes may be more prone, though any breed can develop uveitis.
If your dog is squinting, avoiding light, or pawing at one eye, it could be a sign of inflammation. You might also notice excessive tearing or cloudiness in the affected eye. Uveitis is a condition that warrants immediate medical attention to prevent complications, including vision loss.
Eye Injury
Redness confined to one eye may indicate a physical injury. This could be the result of a scratch, foreign object, rough play, or even self-inflicted trauma during grooming or itching.
Check your dog’s eye closely for debris, scratches, or swelling. If your dog resists your inspection or seems to be in pain, that’s your cue to seek help from a veterinarian. Untreated eye injuries can quickly escalate into infections or corneal ulcers.
Allergies
Allergies don’t just cause sneezing and itching—they can also affect your dog’s eyes. Common allergens include pollen, dust mites, mold spores, or even ingredients in your dog’s food. When exposed to these triggers, your dog’s immune system may overreact, leading to red, watery, and itchy eyes.
In seasonal cases, eye redness may worsen during certain times of year. If you suspect allergies, try tracking when symptoms flare up and talk to your vet about testing or lifestyle adjustments that may help alleviate the reaction.
Glaucoma
Glaucoma occurs when fluid builds up inside the eye, increasing intraocular pressure and potentially damaging the optic nerve. In dogs, this condition can come on suddenly and cause severe discomfort.
Signs of glaucoma include redness, bulging of the eyeball, cloudiness, and dilated pupils. Dogs may also seem more lethargic or sensitive to light. Glaucoma is a medical emergency in pets and often requires surgical or medical intervention to preserve vision.
Corneal Ulcers
Ulcers on the cornea—commonly called corneal ulcers—are open sores that develop as a result of injury or persistent irritation. These ulcers are usually painful and can become infected if not addressed quickly.
Look for signs such as blinking more than usual, excessive discharge, and your dog trying to keep one eye shut. You may also notice a visible white or grayish spot on the cornea. If you suspect an ulcer, don’t delay—early treatment significantly improves outcomes.
Dry Eye Syndrome (Keratoconjunctivitis Sicca)
Dogs produce tears to keep their eyes lubricated and clean. If tear production slows or stops, dry eye syndrome can occur, leaving the eyes red, itchy, and vulnerable to infections.
Dry eye often leads to thick, sticky discharge and visible irritation. You may also see your dog blinking or squinting frequently. Fortunately, this condition can often be managed with medicated drops that help stimulate tear production or replace moisture.
When to See a Veterinarian
Some causes of eye redness in dogs—like minor allergies or temporary irritation—may resolve on their own. However, persistent redness, discharge, swelling, or signs of pain are all clear indicators that your pet needs professional care.
Veterinarians can perform eye pressure tests, tear production evaluations, and visual inspections to diagnose the problem. Depending on the cause, treatment may involve medication, surgery, or lifestyle adjustments.
Final Thoughts
Your dog’s eyes are more than windows to their soul—they’re also valuable indicators of overall health. Paying attention to signs like redness, swelling, or behavioral changes can help you catch issues early and prevent more serious complications.
If you ever feel unsure about your dog’s eye health, it’s always better to err on the side of caution. A quick checkup could make all the difference in protecting your pup’s vision and comfort.
