Glaucoma in Dogs: Emergency Signs and Treatment

By Tailwisp Editorial TeamUpdated October 17, 20263 min read

Glaucoma is one of the true eye emergencies. Acting quickly can make the difference between saving and losing vision.

What it is

The eye constantly produces and drains fluid. In glaucoma, drainage is blocked, and pressure builds, harming the optic nerve and retina. It can be primary, often inherited, or secondary to other eye problems such as lens luxation, inflammation or tumors.

Signs

• Red or bloodshot eye
• Cloudy or bluish cornea
• Enlarged or bulging eye
• Squinting and tearing
• Dilated pupil that does not react
• Eye pain, pawing, lethargy or loss of appetite
• Vision loss

See why is my dog's eye red or discharging for other causes of redness.

Why it is urgent

Prolonged high pressure can permanently damage the eye in a short time. Go to your vet or an emergency clinic right away if you suspect glaucoma.

Breeds at risk

Primary glaucoma is more common in breeds such as cocker spaniels, basset hounds, Shar-Peis, Siberian huskies, beagles and some terriers. Ask your vet whether your dog's breed has known risks and what screening exists.

Diagnosis

Your vet or eye specialist measures eye pressure with a tonometer and examines the eye, including drainage angles. Other tests may look for underlying causes.

Treatment

• Emergency medication to lower pressure quickly
• Ongoing eye drops and oral medication
• Surgery, such as procedures to reduce fluid production or help drainage
• Removal or implants for a blind, painful eye
• Treating underlying disease in secondary cases

A veterinary ophthalmologist can advise on the best approach.

Comfort and quality of life

A blind eye that remains painful needs treatment, and many dogs feel better after a painful eye is removed or treated. Dogs adapt well to vision loss, and many return to normal life.

The other eye

In primary glaucoma, the second eye is often at risk. Your vet may recommend preventive drops and regular pressure checks.

At home

• Give medication exactly as prescribed.
• Use a cone to prevent rubbing.
• Keep a calm environment.
• Report any change immediately.

Cataracts and lens problems

Some eye diseases raise glaucoma risk. See cataracts in dogs. Regular exams can catch issues early.

Common mistakes

• Waiting overnight.
• Treating redness at home.
• Stopping drops.
• Ignoring the other eye.

Troubleshooting

• The eye looks cloudy and sore: go to a vet now.
• My dog resists drops: ask for ways to make it easier.
• Vision seems lost: keep routines and offer support.

A simple plan

1. Seek emergency care.
2. Follow treatment.
3. Monitor the other eye.
4. Keep rechecks.

Real-life examples

A cocker spaniel squints and has a red eye, and fast pressure treatment saves some vision. A husky loses vision in one eye but keeps the other with drops and checks. A terrier needs an eye removed for comfort and thrives. Speed and care matter.

Acting quickly

If an eye looks painful, red and cloudy, treat it as urgent.

What to do on the way to the vet

Keep your dog calm and prevent rubbing the eye. Do not apply drops or pressure to the eye unless a vet tells you to. Call ahead so the clinic can prepare, and bring a list of any medications your dog takes. Speed matters more than perfection.

Long-term management

Glaucoma often requires lifelong medication and regular pressure checks. Keep a log of drop times, watch for redness or squinting and attend every recheck. Even if vision is lost, treatment keeps the eye comfortable. Many dogs adapt well to life with one or no functioning eye.

Costs and planning

Emergency care, specialist visits and long-term drops can add up. Ask for estimates and talk about options early. See dog vet cost guide.

The takeaway

Glaucoma is an emergency. Seek immediate veterinary care and monitor the other eye.

This article is general educational information, not veterinary advice. Every dog is different. If your dog is unwell, or you are unsure about a symptom, diet change or medication, contact your veterinarian.