Glaucoma in Dogs: Symptoms & Diagnosis
Just like humans, glaucoma in dogs is an eye condition where intraocular pressure (fluid pressure inside the eye) builds and there is insufficient fluid drainage which can cause optic nerve damage, vision loss and further complications. While many dog breeds can be genetically predisposed to glaucoma, any dog could be diagnosed. “Early diagnosis almost never happens,” says Dr. Gary Richter, MS, DVM. “Pet owners see it when the eye is red and painful, and in many cases, it’s already advanced and difficult to manage.”
Glaucoma tends to occur in older dogs, and those with cataracts can be at greater risk. It is classified as primary and secondary: Primary glaucoma means there is no underlying disease whereas secondary glaucoma is caused by an underlying disease, infection, irritation, injury or tumor.
Signs and symptoms for sudden primary glaucoma:
- High pressure within the eye, as tested by a vet
- Excessive blinking
- A receding look to the eyeball (or physical recession)
- Redness of the blood vessels in the whites of eyes
- Cloudy appearance at front of the eye
- Dilated pupil that does not respond to light
- Vision loss, although difficult to determine – most pets compensate extremely well with the loss of vision in one eye, so you may not realize your dog is blind.
- Pain – Dogs usually have a higher level of pressure than humans when diagnosed with glaucoma, and they often do not let you know they’re suffering. Usually glaucoma results in headaches and migraines – you may notice your dog doesn’t want to play, eat, and is acting irritable.
Signs and symptoms for the more common diagnosis of secondary glaucoma are similar to the primary signs above, but also include:
- Inflammatory debris visible in the front of the eye
- Possible constriction of the pupil, rather that dilation
- Iris complications – pet parents report that the iris (the colored circle around the pupil) “sticks” to the cornea or lens; best practices indicate that if your dog’s eye looks strange, call the vet.
If you suspect your dog is suffering from glaucoma, get to the vet immediately! It is recommended to have emergency treatment as soon as possible to save vision in your pup’s eye.
While at the vet, give a good rundown of your dog’s health history, especially any recent trauma to the eye – even minor scrapes are important to note. Your vet will test your dog’s eye pressure with a veterinary tonometer, a little gadget that looks almost like a thermometer. If the diagnosis is glaucoma, your vet may refer your pup to a veterinary ophthalmologist to check out both eyes. There they will determine what further treatment may be needed – whether that is prescription medicine or surgery is up to the condition of your pup. Prescription drugs lower the pressure in your pup’s eye to get it down to a normal range in order to salvage vision, and Cyclocryotherapy, a draining procedure where cells are frozen to stop producing fluid, is another treatment option. Ultimately, though, many dogs suffering from glaucoma have the eye removed.
Most dogs adjust over time to the loss of their eye, especially if they’d been blind for a long period of time before removing the eye. Pet parent Kathie of Buddy Lee says of the process: “We really thought [Buddy Lee’s] quality of life would be affected – but he was fine! His personality is still the same, he just looks like he’s winking.” Dogs will need to be monitored outdoors, as they are more vulnerable, but overall, they adapt well to their situation, depending on their other keen senses and sometimes, dogs in their pack that act as guides.
More than half of dogs with primary glaucoma will have symptoms and develop glaucoma in their unaffected eye within 8 months of the first diagnosis. Therefore, it’s important to schedule follow-ups with your vet to prevent and treat. Having pet insurance can help immensely – while surgery is no doubt expensive, diagnostic testing can be costly too and monthly prescriptions can add up. Find out more by checking out our report on the Cost of Pet Health Care.