Cataracts in dogs are cloudy changes in the lens that scatter light and, as they thicken, blur and eventually block vision. You see them as a white, grey or blue-white opacity behind the pupil. Many dogs cope well, but an untreated cataract can lead to painful inflammation or glaucoma, so any new cloudiness needs a vet's eye exam. If you share your home with a Poodle, Cocker Spaniel, Bichon Frise or a diabetic dog, from Glasgow to Bristol, check early. If you’re trying to describe what you’ve noticed, Subconjunctival Haemorrhage in Dogs and Ectropion in Dogs explain what to look for. To work the relevant checks into your usual routine, see Best Dog Eye Cleaner for Tear Stains.
You can use Can Dogs See Color? What Blue, Yellow, Red and Green Look Like and Dog Third Eyelid Showing to look up the details that apply to your dog.
What are cataracts in dogs?
The lens sits behind the pupil and focuses light onto the retina. A cataract is any opacity in the lens or its capsule. Vets usually describe four stages: incipient (a small spot, vision normal), immature (more of the lens cloudy, vision reduced), mature (whole lens opaque, vision lost) and hypermature (the lens shrinks and leaks protein, often causing inflammation). To put those observations in context, see Pannus in Dogs UK for related questions about eye care and changes to watch for. For more detail on eye care and changes to watch for, see Over-the-Counter Eye Drops for Dogs.
For related questions about eye care and changes to look out for, read Green Eye Discharge in Dogs and Dog Corneal Ulcer. If you’re comparing approaches to eye care and changes to look out for, see Dog Eye Allergy or Infection? Why an Examination Matters and The Origins of Veterinary Clinical Nutrition.
Cataracts or nuclear sclerosis?
Many older dogs develop a bluish-grey haze in both eyes. This is usually nuclear sclerosis, a normal age-related stiffening of the lens that typically does not cause significant sight loss. A cataract looks whiter and denser and can appear at any age. You cannot reliably tell the two apart at home, so see our guide to dog cloudy eye. For practical steps you can use when planning everyday care, see Dog Eye Cleaner.
For more on the signs and questions to take into account, read Dog Eye Stye and Dog Pink Eye. If you’re comparing approaches to eye care and changes to look out for, see Dog Squinting One Eye and Swollen Eye in a Dog.
Signs to watch for
- A white, grey or blue-white spot or haze behind the pupil.
- Hesitating on stairs, bumping into furniture, misjudging jumps on dark winter evenings.
- Startling when touched, or struggling to find a thrown toy.
- Redness, squinting or a change in eye size: these point to inflammation or pressure and are urgent. See glaucoma in dogs and uveitis in dogs.
Causes and at-risk breeds
Causes include inherited cataracts, ageing, diabetes mellitus, eye inflammation and trauma. A review of dogs seen at North American veterinary teaching hospitals from 1964 to 2003 (Gelatt and MacKay, 2005) found about 60 breeds above the 1.61% baseline of mixed-breed dogs, with the Miniature Poodle at 10.79% and the Bichon Frise at 11.45%. Cataracts affected 16.80% of mixed-breed dogs aged 7 to 15 or older. These are North American figures, so ask your vet how they apply to your breed here. For a breed-specific example of the questions to consider, see Poodle Dog Breed Guide, Small Hypoallergenic Dogs and Small Hypoallergenic Dogs in the UK. If you’re comparing care needs between breeds, use What Dog Breed Lives the Longest? Median Lifespan Data for 155 Breeds, With Sample Sizes for more detail.
If you’re comparing approaches to eye care and changes to look out for, see Dry Eye in Dogs, How to Get Something Out of My Dog's Eye and Red Eyes in Dogs.
Diabetes: the fast route to cataracts
In 200 diabetic dogs (Beam et al., 1999), half had developed cataracts by about 170 days after diagnosis, 75% by 370 days and 80% by 470 days. If your dog has just been diagnosed, ask your vet about an early eye check rather than waiting for visible cloudiness. To put those observations in context, see Blocked Tear Duct in Dogs for related questions about eye care and changes to watch for. If you want to explore the related questions about eye care and changes to watch for, start with Dog Blinking.
For more detail on eye care and changes to look out for, start with Dog Eye Boogers and Dog Eye Health.
Treatment
| Option | What it does | Evidence |
|---|---|---|
| Phacoemulsification | Removes the clouded lens; an artificial lens is often placed | In diabetic cataracts, 94.8% of operated eyes had vision at last follow-up vs 7.6% with drops alone (Lee et al., 2023) |
| Anti-inflammatory drops | Controls lens-induced inflammation | Manages complications; does not remove the cataract |
| Monitoring | Regular rechecks for pressure and inflammation | Reasonable when the dog is comfortable |
Surgery carries risk: in 172 dogs (Sigle and Nasisse, 2006), glaucoma stayed under 10% until after the first postoperative year and was more likely with hypermature cataracts. In the UK, surgery is usually done at a referral ophthalmology centre, often on referral from your own vet. Check whether your pet insurance is lifetime or time-limited, and whether it excludes pre-existing or hereditary conditions. Our dog cataract surgery cost guide explains what drives fees. To put those observations in context, see Cherry Eye in Dogs for related questions about eye care and changes to watch for.
If you want to look at the options in more detail, start with Entropion in Dogs. If you’re comparing approaches to eye care and changes to look out for, see Dog Eye Twitching and Watery Eyes in Dogs.
Can you reverse cataracts at home?
Current research does not strongly prove that any drop, supplement or home remedy dissolves an established canine cataract. See eye supplements for dogs for what the evidence does and does not show. If you’re weighing a product in this area, Angel Eyes for Dogs UK can help with the label checks.
For more detail on eye care and changes to look out for, start with Dog Ear and Eye Cleaners and How to Clean Around a Dog's Eyes.
Daily eye hygiene alongside veterinary care
Pure Majesty Pets Dog Eye Drops are ophthalmic-grade, sterile-filtered (10 micron), pH 7.0 to 7.2 to match natural tears, with sodium hyaluronate 0.05%, chamomile 2%, aloe vera 8% and sodium phytate 0.15%; plain saline contains none of these. They are non-medicated hygiene drops that do not treat cataracts and never replace your vet's care. Read our pillar guide on dog eye infection warning signs or visit the Pure Majesty Pets homepage. For the separate safety questions that can come up here, see Saline Solution for Dogs' Eyes.
For more detail on eye care and changes to look out for, start with Dog Eye Wipes, Best Tear Stain Remover for Dogs and Pekingese Dog Care.
Frequently asked questions
What do dogs with cataracts see?
It depends on the stage: little change early on, blurry and dim vision as the lens clouds, and light and shadow at most once mature.
For more on eye care and changes to look out for, see Bacterial Eye Infection in a Dog.
Do cataracts hurt dogs?
Not usually, but the inflammation or pressure that can follow does. Redness or squinting needs prompt attention.
Can diet or supplements cure cataracts?
Current research does not strongly prove it. Surgery is the only treatment shown to restore vision.
Scientific References
- Gelatt KN, MacKay EO. Vet Ophthalmol. 2005;8(2):101-111. PMID 15762923.
- Beam S, Correa MT, Davidson MG. Vet Ophthalmol. 1999;2(3):169-172. PMID 11397260.
- Sigle KJ, Nasisse MP. J Am Vet Med Assoc. 2006;228(1):74-79. PMID 16426170.
- Lee E, et al. J Vet Sci. 2023. PMID 38031522.
- Merck Veterinary Manual. Disorders of the Lens in Dogs.
This article is for information only and is not veterinary advice. A cloudy eye with redness, squinting or swelling is urgent: contact your vet or an out-of-hours clinic. Talk to your vet before starting any product, especially if your dog is pregnant, nursing, on medication or has a diagnosed condition.