7 Key Symptoms and Management Tips for Canine Conjunctivitis Recommended by Veterinarians

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Most cases of conjunctivitis in dogs are caused by infections. With proper treatment and care, recovery is possible. We’ve compiled the best products and key selection criteria that pet owners should know.

Canine conjunctivitis is an inflammation around the eyes

A dog’s eye showing symptoms of conjunctivitis

Canine conjunctivitis is an inflammatory condition affecting the conjunctiva, the thin membrane lining the inner eyelids and covering the white of the eye. In dogs, it often accompanies respiratory infections such as kennel cough, and common causes include allergies, trauma, foreign bodies, eyelid abnormalities (such as entropion), and dry eye resulting from insufficient tear production. (Herpesvirus and chlamydia are primarily concerns in cats.) Symptoms include redness, itching, excessive tearing, and discharge that may be clear or yellowish. Particular attention should be paid if your dog rubs its eyes or shows signs of discomfort. Early detection improves treatment outcomes, making an accurate diagnosis by a veterinarian essential. Using incorrect medications can worsen symptoms or impair vision, so never attempt self-treatment.

Good to know: Conjunctivitis management

When selecting a conjunctivitis treatment for your dog, it’s important to first identify the cause of infection and the type of symptoms. Viral conjunctivitis requires products containing antiviral agents, while bacterial conjunctivitis needs those with antibiotics. If your dog has excessive tearing or mucous discharge, products with anti-inflammatory ingredients are more effective. Gel or liquid formulations are generally better tolerated by dogs and easier for owners to apply. Always complete the full course of any veterinarian-prescribed medication. Early treatment and consistent care are key to recovery.

Good to know 1: What is conjunctivitis?

Conjunctivitis is an inflammation of the conjunctiva, the thin membrane lining the inside of the eyelids and covering the white part of the eye. It typically causes redness, increased discharge or tearing, frequent blinking, and eye rubbing. In dogs, conjunctivitis can have various causes. It often occurs alongside respiratory infections like kennel cough, but can also result from trauma, foreign bodies, irritants, allergies (such as atopy), dry eye (keratoconjunctivitis sicca) due to insufficient tear production, or eyelid abnormalities like entropion. Herpesvirus and chlamydia are more commonly associated with conjunctivitis in cats. Because treatment depends on the underlying cause, simply wiping away discharge is often insufficient, making a veterinary examination essential to identify the root issue.

Good to know 2: Identify the cause through diagnosis and treat

Conjunctivitis is diagnosed by examining the conjunctiva and cornea, and if necessary, by performing tear production tests or fluorescein staining to check for corneal damage or dryness. If an infection is suspected, further testing may be conducted to identify the causative pathogen. Treatment involves prescription medications such as antibiotic or antiviral eye drops, tailored to the underlying cause by your veterinarian. It’s important to note that viral conjunctivitis won’t resolve with antibiotics alone, making accurate diagnosis crucial. Avoid using human eye drops or products found online without veterinary guidance, as they can worsen the condition. Always follow treatment plans based on a proper diagnosis.

Using a cotton swab dipped in eye cleanser on your dog’s eyes

Good to know 3: Learn about management and prevention of recurrence

Administer the prescribed eye drops consistently as directed, and gently wipe away any discharge using clean gauze and sterile saline. Prevent your pet from rubbing their eyes, and if you have multiple animals, be cautious, as infectious conjunctivitis can spread to others. This condition is prone to recurrence or worsening when the immune system is compromised or during periods of stress, so maintaining a stable, calm environment is beneficial. If symptoms persist or recur, schedule a follow-up visit to identify any underlying causes.

Points to note about conjunctivitis

Item	Key Points
Condition	Conjunctival inflammation causing redness, eye discharge, tearing, and rubbing of the eyes
Causes in Dogs	Varied, including respiratory infections such as kennel cough, trauma, foreign bodies, allergies, dry eye, and eyelid abnormalities (herpes and chlamydia are mainly in cats)
Diagnosis & Treatment	After identifying the cause, veterinarian prescribes antibiotic, antiviral, or anti-inflammatory eye drops
Caution	Do not use human eye drops or arbitrary products; viral cases do not resolve with antibiotics alone
Management & Prevention	Keep eye discharge clean, watch for transmission in multi-cat/multi-dog households, manage immunity and stress

This is not a table recommending specific products or clinics, but a reference for when you consult a veterinarian. Treatment and testing decisions must always be made together with a veterinarian through an examination.

Caution: Do not self-diagnose; always visit a veterinarian

If your dog’s eyes become red or produce discharge, do not attempt to treat them at home. Viral and bacterial conjunctivitis require different treatments. Using the wrong medication can worsen symptoms or cause permanent eye damage. Please use only medications diagnosed and prescribed by a veterinarian.

Usage tip: How to help your dog accept it comfortably

If your dog dislikes eye drops, it can cause significant stress. Start by slowly approaching with your hands to help them get used to it. Gently touching around the eyes can make the process easier for your dog. Before applying the medication, calm your dog down and handle the situation quickly and gently. Offering treats as a reward can also be helpful. Never force the issue; instead, take your time and gradually help them adapt, which is key to success. Pay attention to your dog’s reactions and adjust your approach flexibly.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently asked questions

Can conjunctivitis in dogs be contagious?

It depends on the cause. If the cough is due to an infectious condition, such as a respiratory infection like kennel cough, it can spread to other animals. If you have multiple pets, it’s safest to isolate the affected animal and manage them separately. However, non-infectious causes such as allergies, trauma, or foreign body aspiration are not contagious.

Can conjunctivitis recur after it has been fully treated?

It can recur depending on the underlying cause. In particular, infectious conjunctivitis may reappear when your pet’s immune system is weakened or under stress, so maintaining a stable environment is key to prevention.

Will my dog get worse if I apply eye drops?

When used with the right product and method, it can actually speed up recovery. Be careful, as using the wrong medication or overusing it can cause irritation.

Is it okay to wash my pet's eyes at home?

It’s fine to gently wipe away discharge with saline solution or an ophthalmic cleanser. However, avoid using harsh cleansers or tap water. Always follow your veterinarian’s instructions.

Can supplements help treat conjunctivitis?

There is currently no clear evidence in veterinary textbooks that supplements help treat conjunctivitis. The cornerstone of treatment is medication prescribed by your veterinarian based on the underlying cause, so if you're considering supplements, it's best to consult with your vet first.