Dog cataracts are one of the leading causes of blindness in our four-legged friends, especially after the age of 7. This condition involves a progressive clouding of the lens that can seriously affect your dog's quality of life. According to recent veterinary studies, around 50% of dogs over the age of 9 show some form of cataract of varying severity, with a particularly high incidence in predisposed breeds such as the Cocker Spaniel, Poodle and Golden Retriever.
What cataracts are and how they develop in dogs
A cataract is the clouding of the lens, the eye's natural focusing structure located behind the iris. When the lens loses its transparency, light can no longer pass through correctly, causing progressive vision loss. Unlike simple nuclear sclerosis (a normal age-related hardening of the lens that does not significantly impair vision), a cataract is a true ocular disease.
The stages of cataract development
Cataracts in dogs develop through progressive stages:
- Incipient cataract: affects less than 10% of the lens, often with no noticeable symptoms
- Immature cataract: involves 10% to 99% of the lens, with noticeable visual impairment
- Mature cataract: complete clouding of the lens, with total blindness in the affected eye
- Hypermature cataract: advanced stage with possible protein reabsorption and inflammatory complications
The difference between cataracts and nuclear sclerosis
Many owners confuse cataracts with nuclear sclerosis, a normal ageing process that gives the lens a greyish-bluish colour. Nuclear sclerosis does not cause blindness and requires no treatment, whereas cataracts progress towards vision loss. Only a specialist veterinary examination can reliably distinguish between the two conditions.
The main causes of cataracts in dogs
Understanding the origin of cataracts is essential for prevention and treatment. The causes are multiple and often interconnected.
Hereditary cataracts and genetic predisposition
Hereditary cataracts account for approximately 60–70% of cases and affect specific breeds. According to ECVO (European College of Veterinary Ophthalmologists) guidelines, the most predisposed breeds include:
- American and English Cocker Spaniel
- Poodle (all sizes)
- Golden and Labrador Retriever
- Boston Terrier and Staffordshire Bull Terrier
- Siberian Husky and Schnauzer
- Bichon Frisé and West Highland White Terrier
In these breeds, cataracts can appear even at a young age, sometimes within the first few months of life. Available genetic tests allow responsible breeders to exclude carrier animals from breeding programmes.
Diabetes mellitus: the most common metabolic cause
Diabetes mellitus is the most frequent acquired cause of cataracts in dogs. Studies show that around 80% of diabetic dogs develop cataracts within 16 months of diagnosis. Chronic hyperglycaemia causes sorbitol to accumulate in the lens, leading to rapid cell swelling and clouding. In these cases, cataracts can develop within just a few weeks, often affecting both eyes.
Other causes of cataracts
Additional factors that can trigger cataracts include:
- Advanced age: senile cataracts after 8–10 years
- Eye trauma: blunt injuries, perforations, foreign bodies
- Chronic uveitis: prolonged intraocular inflammation
- Nutritional deficiencies: essential amino acid deficiencies in artificially reared puppies
- Exposure to radiation or toxic substances
- Systemic diseases: hypocalcaemia, hypertension
How to recognise cataracts at home: signs you should not ignore
Spotting the signs of cataracts early can make a real difference to the effectiveness of treatment.
Visible changes in the eye
The most characteristic symptom is the appearance of a white or greyish opacity at the centre of the pupil, most noticeable in direct light. At first it may look like a small spot that gradually grows larger. In advanced stages, the entire pupil takes on a milky or pearly appearance.
Behavioural changes
Watch out for these behaviours that indicate visual impairment:
- Hesitation when moving: the dog proceeds cautiously, especially in poorly lit environments
- Difficulty finding the bowl or toys: relies more on smell to navigate
- Bumping into furniture or objects: especially if they have been moved from their usual position
- Reluctance to climb stairs or jump onto the sofa
- Increased anxiety in new situations or in the dark
- Changes in play behaviour: no longer chases a thrown ball
Simple home orientation tests
You can carry out simple tests (which do NOT replace a veterinary visit):
- Cotton ball test: silently drop a cotton ball in front of the dog; a dog with normal vision will follow the movement
- Obstacle test: arrange chairs or boxes along a familiar route and observe whether the dog avoids them
- Menace response: move your hand quickly towards the eye (without touching it); the absence of a blink may indicate visual impairment
Veterinary diagnosis: examinations and specialist assessments
An accurate diagnosis requires a complete ophthalmic evaluation by a veterinarian, preferably one who specialises in veterinary ophthalmology.
Full ophthalmic examination
The consultation includes several diagnostic stages:
- Slit-lamp examination: allows assessment of all ocular structures and classification of the cataract stage
- Ophthalmoscopy: examines the retina to rule out concurrent conditions
- Schirmer tear test: measures tear production
- Tonometry: checks intraocular pressure
- Gonioscopy: evaluates the iridocorneal angle
Essential pre-surgical examinations
Before a possible procedure, thorough testing is required:
- Electroretinography (ERG): assesses retinal function; essential for determining whether the retina is healthy and whether surgery will restore vision
- Ocular ultrasound: visualises the posterior structures of the eye when the cataract is too dense for ophthalmoscopy
- Full blood tests: to rule out diabetes, kidney or liver problems
- Blood pressure measurement: hypertension is a contraindication
The cost of a specialist ophthalmic consultation ranges between €80 and €150, while complete pre-surgical tests can reach €300–500.
When surgery is not indicated
Not all dogs are ideal candidates for the procedure. Contraindications include active uveitis, uncontrolled glaucoma, retinal detachment, very advanced age with serious systemic disease, or a poor expected visual recovery as shown by ERG.
Phacoemulsification: the surgical solution
Phacoemulsification is the gold standard for the surgical treatment of cataracts in dogs, with success rates above 90% when performed by experienced surgeons.
How phacoemulsification works
The procedure involves:
- General anaesthesia: essential to keep the patient completely still
- Microsurgical corneal incision: approximately 3 mm
- Emulsification of the lens: ultrasound waves break up the cloudy lens
- Aspiration of fragments: complete removal of the cataractous material
- Implantation of an artificial intraocular lens (IOL): restores refractive power (not always necessary)
- Microsurgical suture: closure of the incision
The procedure takes approximately 45–90 minutes per eye. Many surgeons prefer to operate on both eyes in separate sessions, 2–4 weeks apart.
Cost of cataract surgery
Costs vary considerably depending on several factors:
- Single-eye surgery: €1,500–€2,500
- Both eyes: €2,800–€4,500
- With IOL implant: add €300–€500 per lens
- University clinics: often less expensive (€1,200–€1,800 per eye)
- Private specialist centres: up to €3,000 per eye
The cost generally includes: pre-operative consultation, anaesthesia, surgery, 1–2 days of hospitalisation, initial post-operative medications and post-surgical check-ups for the first 2–3 months.
Post-operative care and prognosis
Recovery requires attention and dedication:
- Elizabethan collar: must be worn 24/7 for 14–21 days
- Intensive medication: antibiotic and anti-inflammatory eye drops 4–6 times daily initially, then gradually reduced
- Complete rest: no running, jumping or rough play for 4–6 weeks
- Frequent check-ups: at 1, 3, 7, 14, 30 and 60 days post-surgery
Vision improves progressively over the first few weeks. Around 90–95% of dogs regain functional vision. Complications (secondary glaucoma, retinal detachment, capsular opacification) occur in 5–15% of cases but are often manageable.
Alternatives and conservative management of cataracts
When surgery is not possible or desired, alternative approaches exist, although none can reverse or halt a cataract.
Eye drops and supplements: what the science says
Many products are marketed as cataract treatments, but the scientific evidence is limited:
- N-acetylcarnosine (NAC): some preliminary studies suggest a possible slowing of progression, but the veterinary literature remains inconclusive
- Antioxidants: vitamin C, vitamin E and lutein may play a preventive role but not a curative one
- Lanosterol: promising in research but not yet available in validated veterinary formulations
It is important to stress that no eye drop currently available can eliminate an existing cataract. At best, these products may slow progression in the very early stages.
Managing a dog with visual impairment
If you choose not to operate or surgery is not indicated, you can significantly improve your dog's quality of life:
- Keep the environment consistent: do not move furniture or food bowls
- Use mats with different textures: these help with tactile navigation
- Communicate verbally: let your dog know before you touch him or her
- Stimulate the other senses: scent games, sound-based toys
- Always use a lead: for safety outdoors
- Adequate lighting: can help in the early stages
- Protect from hazardous obstacles: pools, stairs, sharp corners
Managing underlying conditions
If the cataract is secondary to diabetes, optimal blood sugar control is essential. Excellent diabetic management (specific diet, well-dosed insulin, regular monitoring) can slow the progression of cataracts and reduce post-surgical complications. Diabetic dogs still have a good surgical prognosis, with success rates of around 85%.
Prevention: can the risk of cataracts be reduced?
Although hereditary cataracts cannot be prevented, some strategies can reduce the risk of acquired forms.
Genetic screening and responsible breeding choices
If you are choosing a puppy from a predisposed breed, verify that the breeder carries out ophthalmic testing on breeding animals. Eye certification schemes (such as those promoted by ECVO) identify animals affected by hereditary cataracts.
Diabetes prevention
Keeping your dog at a healthy weight, with a balanced diet and regular physical activity, dramatically reduces the risk of diabetes mellitus and therefore of diabetic cataracts. Obesity is a significant risk factor for type 2 diabetes in dogs.
Eye protection and regular check-ups
- Annual ophthalmic check-ups: particularly after the age of 7 or in predisposed breeds
- Protection from trauma: take care during play and in environments with dense vegetation
- Prompt treatment of uveitis: chronic eye inflammation promotes cataract development
- Quality nutrition: diets that comply with FEDIAF/AAFCO guidelines ensure adequate nutritional intake
Frequently asked questions
Can cataracts in dogs always be operated on?
No, not all cases are suitable for surgery. The procedure is indicated when cataracts significantly affect quality of life, the retina is functional (confirmed by ERG), there is no active inflammation and the dog's general health allows for anaesthesia. Very advanced cataracts with complications (lens-induced uveitis, glaucoma, lens luxation) may require different approaches or be inoperable. Assessment by a veterinary ophthalmologist is essential to determine whether surgery is appropriate.
How quickly do cataracts get worse?
The rate of progression varies enormously. Diabetic cataracts can develop within weeks or months, causing rapid blindness. Senile cataracts progress more slowly, over months or years. Hereditary cataracts vary in their timeline depending on the breed and the specific genetic form: some appear in puppies and progress quickly, while others develop in adulthood and evolve more slowly. Regular ophthalmic check-ups (every 6–12 months) allow progression to be monitored and the procedure to be planned at the optimal time.
Is a dog in pain with cataracts?
Cataracts themselves are not painful. However, they can cause discomfort and stress related to vision loss: disorientation, anxiety and a reduced quality of life. In addition, mature or hypermature cataracts can lead to painful complications such as phacoclastic uveitis (inflammation caused by proteins leaking from the lens) or secondary glaucoma (increased intraocular pressure). These conditions are very painful and require urgent treatment. This is why veterinary monitoring is important even if you choose not to pursue surgery.
Are there breeds that are immune to cataracts?
No breed is completely immune, as senile cataracts and those secondary to trauma or disease can affect any dog. However, some breeds have a very low incidence of hereditary cataracts. Breeds such as the German Shepherd, Rottweiler, Dobermann, Boxer and many mixed-breed dogs show lower genetic predisposition. Even within predisposed breeds, not every individual will develop cataracts: carrying a predisposing gene does not guarantee that the disease will appear. Responsible genetic selection is reducing the incidence in historically affected breeds.
Cataracts in dogs represent a significant but manageable challenge, thanks to advances in veterinary surgery. Phacoemulsification offers excellent prospects for visual recovery, dramatically improving your companion's quality of life. Even without surgery, with the right environmental adaptations, dogs adapt remarkably well to blindness. The key is early diagnosis and consultation with qualified specialists. For more on caring for an older dog and their specific needs, or to better understand the requirements of the most predisposed breeds, see our specialist guides.
