One eye looks blue and bloodshot this morning. He is holding it half shut, he flinched when you touched his head, and he has not touched breakfast.
Quick answer: Glaucoma is high pressure inside the eye, and in dogs it is an emergency. A red eye with a bluish, steamy cornea, a wide pupil that does not shrink in light, squinting and pain means a vet today, because the optic nerve can be permanently damaged within 24 to 72 hours. Treatment starts with pressure-lowering drops, and once one eye is diagnosed, the other eye needs preventive drops and regular pressure checks.
What to do right now
- Call your vet or the nearest emergency clinic. Say "red, cloudy eye, wide pupil, I think it could be glaucoma" so they know how urgent it is.
- Do not wait for morning if it started tonight and he is in pain.
- Use nothing in the eye that was not prescribed for this problem, including leftover drops from an old infection.
- Stop the rubbing. If you have a cone from a past visit, put it on for the drive.
- Ask for both eyes to be measured. The "good" eye matters too: in primary glaucoma it is usually next.
Signs of glaucoma in dogs
- A red, bloodshot eye, often with a blue or grey haze across the whole cornea
- A pupil that stays large and does not shrink in bright light
- Squinting, holding the eye shut, pawing or rubbing, head-shyness
- Lethargy, hiding, going off food, a dog who suddenly seems old
- Bumping into things on one side, not following movement on that side
- An eye that looks larger or bulges compared with the other, within days
Is glaucoma painful for dogs?
Yes. It is a deep, headache-type pain, and dogs rarely show it by crying. They go quiet, sleep more and stop eating. If your dog has any two of the signs above, do not wait to see if it settles.
What is glaucoma in dogs?
The eye constantly makes fluid and drains it through an angle where the iris meets the cornea. When that drain fails, fluid backs up and the pressure climbs from a normal 10 to 20 mmHg to 30, 40, 60 or more. The pressure crushes the optic nerve and the retinal cells that feed it, and it forces fluid into the cornea, which is why the eye looks cloudy. At high pressures the nerve damage becomes permanent within a day or two.
Primary vs secondary glaucoma
Primary glaucoma is an inherited narrowing or malformation of the drainage angle. It shows up in middle-aged and older dogs and runs in Cocker Spaniels, Basset Hounds, Beagles, Chow Chows, Shar-Peis, Siberian Huskies, Samoyeds, Boston Terriers, Bouviers des Flandres, Norwegian Elkhounds and others; dog breeds prone to eye problems has the full list. It almost always reaches both eyes in the end, one first.
Secondary glaucoma happens when something blocks the drain: inflammation inside the eye (uveitis), a lens that has slipped out of place (common in terriers), a mature cataract leaking protein, bleeding, or a tumour. Any breed, any age. Treating the cause early is everything, which is why a maturing cataract needs regular pressure checks and why a red eye in a diabetic dog is urgent (see diabetic dog cataracts).
How is glaucoma in dogs treated?
- Measure. A tonometer reads the pressure in both eyes in seconds.
- Lower it fast. Prostaglandin drops such as latanoprost, carbonic anhydrase inhibitors such as dorzolamide, beta-blockers such as timolol, and in a crisis, intravenous mannitol to pull fluid out of the eye.
- Find the cause. The vet looks for uveitis, a slipped lens, a cataract or a tumour, and examines the drainage angle.
- Refer. A veterinary ophthalmologist can offer laser treatment that reduces fluid production (cyclophotocoagulation), a drainage shunt, or for a blind, painful eye, removal or a prosthetic implant so the dog is comfortable.
Can a dog live with glaucoma?
Yes, and many live well. Primary glaucoma is managed, not cured: drops buy months to years, surgery extends that, and many dogs eventually lose sight in the first eye. A blind eye without pain is not a tragedy for a dog. Removing a blind, painful eye is often the kindest outcome, because the headache finally stops.
Dogs adapt to one eye, and even to none, when the home stays predictable. 12 signs your senior dog is losing vision has the home plan.
Protecting the other eye
In primary glaucoma the second eye typically develops the disease within months to a couple of years. Preventive pressure-lowering drops in the healthy eye have been shown to delay that, and a pressure check every three to six months catches a rise before it does damage. Ask for both on the day the first eye is diagnosed.
Keep a simple drop chart on the fridge. With several drops a day, a missed dose is easy, and in glaucoma the drops are the plan.
For the slow changes of aging eyes, not glaucoma
Be clear on this: no supplement lowers eye pressure, and no supplement treats or prevents glaucoma. If your dog has glaucoma, the vet's drops and pressure checks are the plan. Ask your vet before adding anything, and never skip a drop.
OcuLabs Vision Support Bites are made for a different, everyday job: the gradual changes most dogs over 7 show, like a hazy look, hesitating at dusk or on the stairs, and missing a dropped treat. For those, a daily chicken chew carries the nutrients aging eyes run on.
- Retina support in bright light. Lutein 6 mg per two chews concentrates in the retina and helps filter blue light.
- Back-up for aging eye cells. Astaxanthin 1 mg gives antioxidant support where the daily wear happens.
- Comfortable, moist eyes. Omega-3 DHA 100 mg supports the tear film and eye moisture.
- Normal eye health, every day. Beta-carotene 1.5 mg adds antioxidant protection.
Give 2 to 4 chews a day depending on your dog's weight (the chart is on the jar and the product page).
Your first jar is covered for 90 days. Not happy, email support@ocupetlabs.com for a full refund of the product price, even if the jar is empty.
Keep reading
- Cloudy eyes in dogs: 7 causes and when to worry
- Best eye supplements for dogs: evidence, ingredients and how to choose
- Astaxanthin for dogs: what it does and how much is enough
- OcuLabs Vision Support Bites vs Ocu-GLO
- Dog breeds prone to eye problems
Frequently asked questions
What are the first signs of glaucoma in a dog?
A red eye with a bluish or steamy-looking cornea, a pupil that stays large in bright light, squinting, pawing at the eye or head-shyness, going quiet and off food from the pain, and vision loss on that side. The eye may look bigger than the other within days.
How quickly can glaucoma blind a dog?
Acute glaucoma can cause permanent optic nerve damage within 24 to 72 hours of the pressure spiking. That is why a red, cloudy, painful eye is a same-day emergency, not a wait-and-see.
Which dog breeds get glaucoma?
Primary glaucoma runs in Cocker Spaniels, Basset Hounds, Beagles, Chow Chows, Shar-Peis, Siberian Huskies, Samoyeds, Boston Terriers, Bouviers and several others. Any breed can get secondary glaucoma from uveitis, a slipped lens, a mature cataract or a tumour.
Can glaucoma in dogs be cured?
Primary glaucoma cannot be cured, only controlled. Drops lower the pressure for a while, laser or shunt surgery can extend that, and a blind, painful eye is often best removed or given a prosthesis so the dog is comfortable. Secondary glaucoma improves when the cause is treated early.
Can I protect my dog's other eye from glaucoma?
Yes. In primary glaucoma the second eye usually follows within months to a couple of years. Preventive pressure-lowering drops in the healthy eye have been shown to delay that, and pressure checks every three to six months catch a rise before it damages the nerve.
General information for dog parents, not veterinary advice. Glaucoma is an emergency: if your dog's eye is red, cloudy or painful, see a vet today, not tomorrow.