FREE Shipping in the U.S. with Purchase over $100

How to Determine If Your Dog Has Eye Problems


Your dog looks at you longingly because he feels safe and comfortable in your presence. You feel the same gazing into his eyes. This exchange may happen several times a day.

But how often do you check her eyes for possible health issues?

Kristen Gervais, Veterinary Ophthalmologist, DVM, MS, DACVO, at VCA South Shore Animal Hospital in Weymouth, Massachusetts, weighed in on how to tell if your best friend might exhibit symptoms that mean she has a health condition affecting her eye(s).

Make Frequent Eye Contact

To best manage your dog’s eye health, pay close attention to her eyes so any problems can be identified in a timely manner, explained Dr. Gervais.

This is especially true for at-risk canines like older dogs and brachycephalic breeds. By conducting regular checks, you can identify any changes that may require a veterinarian’s advice, Dr. Gervais urges.

“Signs to watch for include squinting, cloudiness or redness of the eyes,” says Dr. Gervais. “For dogs with long hair around their eyes, it’s wise to keep this hair cut short so you can see the eyes better.”


Watch for These Indicators

A wide variety of conditions can affect a dog’s eyes, but the visible symptoms tend to be similar. Warning signs of an ophthalmic problem include squinting and discomfort exhibited by rubbing at the eyes. Some types of eye pain (for example from high pressure) can cause lethargy and decreased appetite. Redness, tearing or excessive discharge, cloudiness or vision loss are also signs something is wrong.

Dr. Gervais tells us what some of these symptoms might indicate:

  • Squinting – A common cause of squinting in dogs is corneal ulceration. Those are abrasions on the cornea, which is the clear window at the surface of the eye. Corneal ulceration is widespread in older dogs and brachycephalic or flat-faced breeds. Squinting and eye discomfort should prompt a vet visit if severe of if it doesn’t resolve in 24-48 hours.
  • Discharge – In middle-aged to older small breed dogs, discharge can mean dry eye (keratoconjunctivitis sicca or KCS). Decreased tear production causes inflammation of the surface of the eyes resulting in eye irritation, redness and often a thick yellow discharge. KCS is very treatable if addressed in a timely manner. To maintain healthy levels of tear production, lifelong application of eye drops is required.
  • Cloudy appearance – With age, a dog’s eyes gradually develop a grayish haze or cloudiness. This is due to a normal change in the eye known as nuclear sclerosis. This occurs as the lens of the eye hardens. Nuclear sclerosis doesn’t impair a dog’s vision, except at very advanced ages like 14 or 15 years. The same type of age-related change occurs in humans and eventually causes us to need reading glasses. Nuclear sclerosis doesn’t affect the canine’s vision and no further treatment is needed.
  • Unequal pupil sizes – When your dog shows an abnormally small pupil, it can be from the pain of a corneal ulcer or an inflammation inside the eye. Unequal pupil size where the pupil is abnormally large can mean glaucoma or a detached retina. However, in older dogs, a normal aging process called iris atrophy can cause changes to the size of the pupils so that they are unequal.
  • Visible third eyelid – Elevation or increased visibility of a dog’s third eyelid (all dogs have this, but you don’t often see it) is usually due to pain or eye irritation. When a dog’s eye hurts, the eye tends to sink back into the eye socket. This allows the third eye to passively raise up over the eye. This may also happen as a dog falls asleep and the muscles around her eye relax, but then it’s not anything to worry about.

“Many eye conditions that cause pain will also cause sensitivity to light, so UV protection can help to improve comfort,” says Dr. Gervais. “Some less common eye diseases are worsened by UV light exposure (for example, pannus in the German Shepherd dog is an autoimmune inflammatory eye disease that is more common in areas of high altitude due to increased UV light exposure).”


Test Your Dog’s Vision

When your dog starts running into furniture, can’t find her water bowl and/or doesn’t want to go outside at night, she may be experiencing loss of eyesight. Dr. Gervais suggests setting up an obstacle course in both very dim/dark lighting and regular day lighting to see if the dog bumps into anything. The menace response can be used - wave a closed fist at the eye and if vision is present, the dog should blink the eye.

Another eye test you can do is to drop two or three cotton balls in front of your dog. If she sees them, she’ll have some sort of a reaction like barking or moving. If she doesn’t react, she may be losing her vision and you should see your vet for a specific diagnosis and to discuss your options.  

It’s wise to check your dog’s eyes frequently for redness, cloudiness, squinting or anything out of the ordinary. An all-over health check once a week where you smell the dog’s breath, brush her teeth, clean out ears and look at the eyes lets you discover changes that might indicate a health issue, sickness or injury.

Older Post
Newer Post


  • My dog has a fear of the dark she no longer leaves her cage until the sun comes up outside

    Francine Beyer
  • My dog has been to the vets and they don’t know what is causing his eye problems. They have said he has lost sight in one eye and the other is severely impaired too. He has white (like cataract) but the vets said he has very little cataracts and doesn’t have any other diagnosable ailment. When white light is shone there is no reaction but when iodine and uv light is used the eye reacts. No one knows why and what could help!

  • My Sheltie-Pekingese mix can’t seem to recognize people from a distance of 25 feet. He can see up close, but becomes frightened if he hears someone approaching him from a distance.

    Debra Moore

Leave a comment

Please note, comments must be approved before they are published

Gear For your Dog


Lens Guide


UV Rating



Recommended Use

Red Mirror

Blocks 99% of UVA and UVB Rays.

Allows 20% of light to pass. Very similar to sunglasses.

Impact Resistant. Mirrored lenses show more scratches than clear or smoke.

Giddy up! The Red Mirror lens is great for most dogs and is very similar to the smoke lens with a bit more style.


Blocks 99% of UVA and UVB

Allows 92% of light to pass

Impact Resistant. Offers best visibility when scratched.

For Everything except protection from brightness. Great for working, hunting or adventure dogs. Blocks UV is impact resistant and often is preferred by dogs. Great training lens, and when it gets scratched the scratches are not as visible to the dog as with other lens options.

Blue Mirror

Blocks 99% of UVA and UVB

Allows 15% of light to pass. Slightly darker than smoke and red mirror.

Impact Resistant. Mirrored lenses show more scratches than clear or smoke

DM's are rolling in! The Blue Mirror lens adds a touch of flare and is one of our darker lenses for dogs who have sensitivity to light. Perfect for use in sunny areas and for those who love that blue mirror look.

Silver Mirror

Blocks 99% of UVA and UVB

Allows 13% of light to pass. Our darkest lens.

Impact Resistant. Mirrored lenses show more scratches than clear or smoke.

STYLE! Add some flavor to the daily grind with our darkest lens, allowing only 13% of visual light to pass through, making it the best option if your dog has light sensitivity.


Blocks 99% of UVA and UVB

Allows 20% of light to pass. Very similar to sunglasses.

Impact Resistant. Offers excellent visibility when scratched.

For everything! Overall the most versatile lens. Great for dogs that are rough on their equipment as it continues to offer good visibility when scratched.F

Green Mirror

Blocks 99% of UVA and UVB

Allows 15% of light to pass. Slightly darker than smoke and red mirror.

Impact Resistant. Mirrored lenses show more scratches than clear or smoke.

The Green Mirror lens adds a touch of flare and is one of our darker lenses for dogs that need some reprieve from the suns brightness.

*VLT = Visual Light Transmission

Close (esc)


Use this popup to embed a mailing list sign up form. Alternatively use it as a simple call to action with a link to a product or a page.

Rex Specs

measure your dog in two steps

  1. muzzle circumference

    Measure the circumference of your dog's muzzle where you expect the goggle to land on their nose - usually around the back of their mouth.

  2. head circumference

    Measure the head circumference where you expect the goggle to land on the forehead - typically an inch or so behind the eyes.

Watch Sizing Video
Goggle Size Head Circumference Muzzle Circumference
X-Small Less than 10.5 in Less than 6 in SHOP X-Small
Small 10.5 in - 12 in 6 in - 8 in SHOP Small
Medium 12 in - 14 in 8 in - 9in SHOP Medium
Large 14 in - 17.5 in 9 in - 11.5 in SHOP Large
X-Large Greater than 17.5 in Greater than 11.5 in SHOP X-Large
Small Wide* 12 in - 15 in 6 in - 9 in SHOP Small Wide

*Designed for dogs with a wide, flat face i.e. Boston Terriers
If your dog is between sizes, select the larger size: This will insure the most functional fit and optimal field of view.

Ear Pro Fit Graphic


Measure the circumference of your dog's head at it's largest point (just in front of the ears and under the chin). If you are between sizes, please go up in size.



2 13" - 15" SHOP Size 2
3 15" - 17.5" SHOP Size 3
4 17.5" - 21" SHOP Size 4


Measure around the dog's neck as loose or tight as you would like the collar to fit.



1 12"-14" SHOP Size 1
2 14"-16.5" SHOP Size 2
3 16.5"-19.5" SHOP Size 3
4 19.5"-24" SHOP Size 4


Rex 2020 Main Menu

Shopping Cart

Your cart is currently empty.
Shop now