Dry Eye (KCS) in Dogs: Signs and Management

By Tailwisp Editorial TeamUpdated October 17, 20263 min read

Tears protect and nourish the eye. When they run short, the eye suffers.

What it is

Dry eye, or KCS, is a condition where tear production falls. The tear film keeps the cornea moist and clear and washes away debris. Without enough tears, the eye becomes irritated, inflamed and prone to infection and ulcers.

Causes

• Immune-mediated disease that attacks tear glands, the most common cause
• Removal of the third eyelid gland. See cherry eye in dogs
• Medication side effects
• Infections or distemper in some cases
• Nerve damage
• Congenital problems
• Hormonal disease in some dogs

Breeds more at risk include cocker spaniels, West Highland white terriers, Shih Tzus, bulldogs, pugs and Lhasa apsos.

Signs

• Thick, yellow or green discharge
• Red, irritated eyes
• Dull or dry-looking cornea
• Squinting or blinking
• Rubbing
• Brown staining or pigment on the cornea over time
• Corneal ulcers. See corneal ulcers in dogs

Diagnosis

Your vet uses a Schirmer tear test, a small paper strip placed at the lower eyelid to measure tear production, and examines the eye with stains. Early testing prevents damage.

Treatment

• Immune-modulating drops, such as cyclosporine or tacrolimus, to stimulate tear production
• Artificial tears or ointments to lubricate
• Antibiotic drops if infection is present
• Regular cleaning of discharge
• Surgery in rare cases when other treatments fail

Treatment often takes weeks to show results and is usually continued for life. Follow your vet's schedule and recheck plans.

Daily care

1. Give drops on schedule, even when the eye looks better.
2. Clean discharge gently. See how to clean dog eyes safely.
3. Protect the eyes from dust, wind and irritants.
4. Watch for changes, and call your vet quickly.
5. Keep rechecks.

Complications

Chronic dryness can lead to corneal scarring, pigment, ulcers and vision loss. Early diagnosis and consistent care reduce risk.

Tips for giving drops

Pair drops with treats, keep sessions calm and wash your hands before and after. Ask your vet to show you the technique. Space medications as directed.

Prevention

You cannot always prevent immune-mediated dry eye, but avoiding unnecessary gland removal and keeping up with regular eye checks help. Tell your vet about any red or discharging eyes early. See dog conjunctivitis.

Common mistakes

• Treating as simple pink eye without testing.
• Stopping drops once discharge improves.
• Using human drops.
• Missing recheck visits.

Troubleshooting

• No improvement after weeks: your vet may adjust treatment.
• The eye looks painful: call right away.
• My dog hates drops: ask about ointments and technique.

A simple plan

1. Get a tear test.
2. Start treatment.
3. Give drops daily.
4. Recheck regularly.

Real-life examples

A cocker spaniel with sticky discharge has a low tear test and improves with drops. A bulldog develops an ulcer from long-standing dryness and needs urgent care. A West Highland terrier does well on lifelong treatment. Consistency pays off.

Staying committed

Dry eye needs patience, but most dogs remain comfortable and keep their vision with good care.

How tear tests work

The Schirmer tear test measures how much wetness a paper strip absorbs in one minute. Low readings suggest dry eye, and your vet interprets results alongside signs. Testing is quick and painless and is repeated at rechecks to see if treatment is working.

Cleaning and comfort

Warm, damp cloths loosen crusts around the eyes. Wipe from the inner corner outward, using a fresh cloth for each eye. Avoid scrubbing. Keeping the area clean reduces irritation and helps medications work.

Long-term outlook

With steady treatment, many dogs regain a healthier tear film and stay comfortable. Some need ongoing adjustments over the years. Keep notes about discharge and eye comfort, and share them at checkups.

The takeaway

Dry eye is manageable with testing, daily treatment and rechecks.

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.