Dog Conjunctivitis

Conjunctivitis, also known as pink eye, is a common eye problem in dogs that causes redness, swelling, and discharge. It can affect one or both eyes and ranges from mild irritation to painful inflammation that threatens vision if untreated.

Dog conjunctivitis causes red, swollen, and teary eyes.
It can be triggered by allergies, infection, or foreign particles.
Some cases spread easily between dogs.
Persistent discharge or pawing at the eyes needs veterinary care.
Early treatment prevents permanent eye damage.

Why Does My Dog Get Conjunctivitis?

Conjunctivitis occurs when the thin membrane covering the white part of the eye and inner eyelids becomes inflamed. It may result from bacterial or viral infection, allergies, foreign objects, or irritants like dust or shampoo. In some dogs, underlying issues such as dry eye, eyelid deformities, or blocked tear ducts can lead to recurring infections. Puppies and dogs with weak immune systems are more prone to developing it, especially in crowded or unhygienic environments.

Types of Dog Conjunctivitis

Bacterial Conjunctivitis

Caused by bacteria such as Staphylococcus or Streptococcus, this type produces yellow or green discharge, sticky eyelids, and swelling. It’s contagious and often occurs alongside respiratory infections.

Viral Conjunctivitis

Linked to viruses like canine distemper or adenovirus. Symptoms start with watery discharge and red eyes before progressing to thick mucus and crusts. It spreads quickly among dogs through contact or shared items.

Allergic Conjunctivitis

Triggered by allergens such as pollen, dust, smoke, or cleaning chemicals. Usually affects both eyes, causing itchiness, tearing, and rubbing without pus-like discharge. Seasonal changes often make it worse.

Irritant or Foreign Body Conjunctivitis

Occurs when dust, grass seeds, or shampoo enter the eye. This type develops suddenly and causes squinting, redness, and excessive tearing until the irritant is removed.

Immune-Mediated or Secondary Conjunctivitis

Some dogs develop chronic inflammation due to autoimmune diseases or eye disorders like dry eye (keratoconjunctivitis sicca). These cases are persistent, requiring long-term care to manage symptoms.

Symptoms of Dog Conjunctivitis

Redness and Swelling

The most obvious sign—eyes appear pink or bloodshot, and the tissue around the eye becomes puffy.

Watery or Mucus Discharge

Clear discharge often means irritation or allergy. Yellow or green discharge indicates infection, while sticky buildup may glue the eyelids shut after sleep.

Squinting or Excessive Blinking

Dogs blink repeatedly to relieve discomfort or pain. Squinting may also signal corneal ulcers, which are medical emergencies.

Cloudy Eyes or Film Over the Cornea

Chronic inflammation may lead to cloudy vision or haziness, indicating deeper eye involvement.

Loss of Appetite & Behavior Changes

Pain or poor vision makes dogs restless or less active. In severe cases, they may stop eating or isolate themselves.

Recurrent Eye Infections

If conjunctivitis keeps returning, it could be due to untreated allergies, tear duct blockages, or systemic illness.

Signs of Emergency

Swollen eyes that bulge, severe pain, or sudden blindness require urgent veterinary care, as these may signal corneal damage or glaucoma.

Crusts or Tear Stains

Persistent discharge dries into crusts, leaving reddish-brown stains beneath the eyes.

Prevention & Dog Care

Eye Hygiene

Clean your dog’s eyes gently with sterile wipes if you notice mild discharge or debris. Avoid using human eye drops.

Monitor Tear Production

Breeds prone to dry eyes (like Pugs or Bulldogs) need routine eye lubrication prescribed by vets.

Diet and Immunity

A balanced diet rich in omega-3 and vitamins A and E helps maintain eye and skin health.

Post-Treatment Care

Finish the entire course of prescribed medication. Even if symptoms improve, stopping early can cause relapse.

Avoid Irritants

Keep your dog away from smoke, perfumes, or dusty areas. Use pet-safe cleaning products.

Dog Conjunctivitis FAQ

Conjunctivitis can result from bacteria, viruses, allergies, or irritants like dust or shampoo. Some breeds with bulging eyes are more prone to irritation.

If your dog’s eyes are red, watery, swollen, or oozing pus, it’s likely conjunctivitis. However, if there’s severe pain, cloudiness, or vision loss, it could indicate a corneal ulcer or glaucoma, see a vet immediately.

Bacterial and viral conjunctivitis can spread to other dogs but rarely to humans. Wash hands and disinfect bedding or toys to stop it from spreading.

Treatment depends on the cause. Vets may prescribe antibiotic drops, antiviral medication, or antihistamines. Regular eye cleaning and follow-up visits are essential.

Keep your dog’s eyes clean, avoid irritants, and schedule routine vet checkups. Regular grooming and healthy nutrition also reduce the risk.

Yes. You can explore more about dog problem and treatment on our dog page to stay informed and prepared.