Your dog’s eyes are not only the “windows to their soul,” they’re also an important part of their overall health. Eye problems in dogs are common and can range from minor irritations to serious conditions that threaten vision. The good news is that most issues can be successfully treated, especially if caught early.
Canine Eye Anatomy 101
Understanding the basic structure of your dog’s eye can make it easier to recognize when something isn’t right. While dogs’ eyes work much like ours, there are a few key differences that help them see better in dim light and detect motion.
Cornea: The clear, curved surface at the front of the eye that lets light in. It’s very sensitive and easily scratched.
Iris and Pupil: The colored part (iris) controls how much light enters through the dark central opening (pupil).
Lens: Sits behind the iris and focuses light onto the back of the eye. This is where cataracts can form.
Retina: The light-sensitive layer lining the back of the eye that sends signals to the brain, allowing your dog to see.
Tapetum lucidum: A reflective layer behind the retina that gives dogs their “eye shine” in the dark and improves night vision.
Third eyelid (nictitating membrane): A protective inner eyelid that sweeps across the eye to remove debris and spread tears. Problems here can cause “cherry eye.”
Tear glands and drainage system: Produce and distribute tears that nourish and protect the cornea. Blockages or reduced tear production can lead to “dry eye.”
Knowing these parts helps you recognize changes when something goes wrong and understand why your veterinarian performs specific tests.
How to Recognize Eye Pain in Dogs
Dogs don’t always show pain in obvious ways, but painful eyes should not be overlooked. Look for:
Squinting or blinking one eye
Light sensitivity (avoiding bright rooms or squinting outside)
Unequal eye size (one eye appearing larger or smaller than the other)
Behavior changes such as irritability, restlessness, or hiding
Other Signs Your Dog May Have an Eye Problem
Watch for these common symptoms:
Redness or swelling around the eye
Pawing or rubbing at the face
Colored or thick discharge
Cloudiness or a change in eye color
Sudden bumping into objects or difficulty navigating
If you notice any of these, it’s best to have your dog examined by your veterinarian. Eye conditions can progress rapidly and result in long term vision loss.
What to Expect at the Vet
Before an eye exam, veterinarians often recommend avoiding topical products arounds the eyes beforehand, as residues can interfere with certain diagnostic tests. Your veterinary team can provide guidance specific to your appointment.
At your visit, your veterinarian may:
Measure tear production
Apply a special dye to look for corneal ulcers or scratches
Check eye pressure to screen for glaucoma
If more advanced testing or treatment is needed, your dog may be referred to a veterinary ophthalmologist, a specialist in eye care.
Common Eye Conditions in Dogs
Conjunctivitis: Inflammation of the tissue around the eye, often with redness and discharge. Infection (“pink eye”) and allergies are common culprits.
Corneal ulcers: Scratches or wounds on the eye’s surface that can be painful and require treatment to prevent vision loss. Certain categories of eye medications, such as those containing steroids, are typically avoided when the cornea is damaged because they can delay healing or worsen injury.
Dry eye (keratoconjunctivitis sicca): The tear glands don’t produce enough tears, leading to irritation, discharge, and risk of infection. The eyes may still produce the mucoid portion of tears that can get stuck on the eyelid.
Cataracts: Cloudiness in the lens that can impair vision; some cases can be surgically corrected. Cataracts can also be a sign your dog has an unmanaged disease, like diabetes.
Lenticular sclerosis: A normal age-related change in older dogs where the lens becomes bluish or hazy. Unlike cataracts, lenticular sclerosis usually does not significantly affect vision and does not require treatment.
Glaucoma: Increased pressure inside the eye, which can cause pain and vision loss if not treated promptly. Like cataracts, glaucoma can also be caused by other diseases that can be treated.
Cherry eye: Prolapse of the third eyelid gland, often seen in young dogs. These glands play an important role in tear production and long-term eye health. Surgical correction is commonly recommended, and outcomes are often better when addressed earlier.
At-Home Care
General eye hygiene, such as keep hair around the eyes neatly trimmed, can help reduce irritation.
Tear staining (especially noticeable in white dogs) is usually a cosmetic rather than medical concern.
A warm, wet compress can help to gently clean eyes of debris. Soaking for a couple of minutes before wiping can soften discharge, especially in pets with longer hair.
Non-medicated, sterile lubricants or saline are sometimes used for comfort while awaiting veterinary evaluation. Ask your veterinary team if this is appropriate for your pet while waiting or your appointment.
Do NOT use medicated over-the-counter eye drops in dogs unless specifically directed by your veterinarian, some human products can make things worse.
Brachycephalic breeds (“smushed-face” dogs like pugs, bulldogs, and shih tzus) are prone to corneal dryness and trauma due to prominent eyes and incomplete eyelid closure.
You cab ask your veterinarian about protective eye lubricants or goggles if your dog spends lots of time outdoors or riding in the wind.
Dog Sense contains information related to veterinary health care and does not replace veterinary advice. For any concerns about your dog's health, consult your veterinarian. Dog Sense content is not individual advice and should be considered in the context of your dog’s individual health needs.
Dog Sense contains information related to veterinary health care. This is intended as educational and does not replace the advice of your veterinarian. If you have concerns about your dog's health it is recommended that you seek your veterinarian’s advice. Dog Sense content is not individual advice and should be considered in the context of your dog’s individual health needs.
Dr. C, DVM - a veterinarian who has worked in private practice and animal welfare while occasionally donating her time to research to improve the safety of animal products. Working in animal welfare inspired her to pursue opportunities that foster open educational dialogue that meet people where they are in their lives. In her spare time she enjoys gardening, hiking, and cooking with her family.