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Is Dog Conjunctivitis an Emergency? Vet-Reviewed Facts & FAQ

Chantelle Fowler

By Chantelle Fowler

Close up of redness and bump in the eye of a dog. conjunctivitis eyes of dog

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Reviewed & Fact-Checked By

Dr. Karyn Kanowski

BVSc MRCVS (Veterinarian)

The information is current and up-to-date in accordance with the latest veterinarian research.

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Conjunctivitis is a relatively common, itchy, and uncomfortable eye condition marked by inflammation of the conjunctiva. It often starts in one eye before spreading through the other. If your dog shows signs of this condition, contact your vet as soon as possible for treatment. If left untreated, conjunctivitis can cause irreversible damage to the eye. Read on to learn more.


What Is Conjunctivitis?

Conjunctivitis is inflammation of the conjunctival tissues. The conjunctiva is the mucous membrane that lines the eyelids and surrounds the whites of the eye (sclera). The conjunctiva works similarly to the mouth and nose lining, acting as a protective barrier against foreign objects and infections.

Dogs have a “third eyelid,” or nictitating membrane, in the inner corner of each eye. This membrane is covered by conjunctiva. It is not usually visible in healthy dogs and will have a pale pinkish white coloring*. When conjunctival inflammation occurs, the eye’s mucous membranes swell, become itchy, and turn a brighter pink or red.

*The third eyelid conjunctiva can be pigmented in certain dog breeds.

The two most common forms of conjunctivitis are Bacterial and Allergic.

Allergic conjunctivitis is the itchy, inflamed condition that results from allergens such as pollens or dust mites. It usually affects both eyes. Bacterial conjunctivitis involves a bacterial infection, usually in one eye, but can spread to both. Cases of severe allergic conjunctivitis can become bacterial if left untreated.

dog pink third eyelid, conjunctivitis
Image By: WANALEELAND, Shutterstock

What Happens If Conjunctivitis Goes Untreated?

If your dog shows signs of this condition, you must see your primary care veterinarian as soon as possible. Although cases of allergic conjunctivitis will often resolve on their own, dogs suffering with it will often rub furiously at their eyes, potentially causing trauma or infection.

If left untreated, bacterial conjunctivitis can cause permanent and irreversible eye damage. The inflammation can damage the eye’s outer layer, the cornea, causing ulceration, scarring, or uveitis (inflammation inside the eye). This can be incredibly painful and may set your dog up for chronic ocular problems.

Should I See an Emergency Vet?

All eye problems should be treated as urgent, but not all of them require a trip to the emergency vet.

If your dog cannot open its eye, if the eye looks red or swollen, or if your dog seems to be either frantic or lethargic, this is an emergency.

If your dog is rubbing the eye/s and the conjunctive looks inflamed, you should make an appointment to see your vet as soon as possible, but it is unlikely to be an emergency, unless the signs get worse.

If you aren’t sure, phone the vet – whether it be an out-of-hours emergency hospital or your usual practice; they will advise you on what to do.

veterinarian doing an ophthalmologic scan of a greyhound dog
Image By: GaiBru Photo, Shutterstock

What Are the Signs of Conjunctivitis?

Allergic Conjunctivitis Bacterial Conjunctivitis
Both eyes are usually affected One eye is usually affected first
Squinting or excessive blinking Squinting or excessive blinking
Redness and swelling around the eyes Redness and swelling around the eyes
Inflamed or redness of the sclera Inflamed or redness of the sclera
Rubbing at the eyes Rubbing at the eye
Clear or cloudy discharge from the eyes Green or yellow discharge from the eye

What Causes Conjunctivitis?

Many things can cause conjunctivitis in dogs, including:
  • Allergies
  • Bacteria infections
  • Foreign body irritation
  • Viral infections (e.g., canine distemper)
  • Ocular tumors
  • Breed-associated conditions (e.g., nodular episcleritis in Collies or Cocker Spaniels)
  • Eyelid abnormalities (e.g., entropion, ectropion, distichiasis, Meibomian cysts)
  • Obstructed tear ducts
  • Corneal ulcers
  • Glaucoma
  • Ocular trauma

How Is Conjunctivitis Treated?

The course of treatment will depend upon the cause of your dog’s conjunctivitis.

If allergies cause it, your vet will likely prescribe eye drops or a steroid-containing ointment. Your pup may require oral steroids or antihistamines.

Bacterial conjunctivitis often requires topical antibiotics, though your vet may recommend the oral type and anti-inflammatory medication if the infection is severe. Viral conjunctivitis usually goes away with time and oral antioxidants to boost your pup’s immune system. Occasionally, oral or topical antivirals are recommended as well.

If it is an eye or eyelid abnormality causing your dog’s conjunctivitis, surgical correction may be required.

Owner giving medicine in a pill to his dog
Image By: Creative Cat Studio, Shutterstock

Can I Catch Conjunctivitis From My Dog?

If the term conjunctivitis sounds familiar, it’s because it affects humans, too. You might know it better as “pink eye”.

It is extremely unlikely that you would catch this condition from your dog. However, if a virus or a bacterial infection causes your dog’s conjunctivitis, it could be transmitted from one dog to another. In addition, bacteria canine conjunctivitis could be passed to humans, but it is very uncommon.

Ensure you wash your hands thoroughly after handling your dog with this condition. Do not touch your eyes or face after you’ve been near an infected dog.

Humans can also suffer from allergic conjunctivitis, so just because your and your dog’s eyes are itchy, does not mean the problem has spread. It’s more likely that you’re just both allergic to the same thing.


Final Thoughts

Conjunctivitis, as innocent as it may seem in humans, should be treated as soon as possible. As soon as you see signs of this condition, make an appointment with your primary care veterinarian for treatment. Any condition involving the eye should be treated as urgent, but conjunctivitis is not considered to be an emergency. While most dogs will fully recover from this condition, early treatment is essential to avoid complications.

Featured Image Credit: Masarik, Shutterstock

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