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Dog's Red Eye: What Could Be the Culprit

Mar 04,2025 | puaintapets

A dog's eyes are not only a window to their soul but also an important indicator of their health. When you notice that your dog's eye is red, it can be a cause for concern. There are numerous reasons why a dog's eye may turn red, ranging from minor irritations to more serious underlying health conditions.

Red Eyes in Dogs

Why Is My Dog’s Eye Red? 

There are several reasons why your dog's eye might be red:

I. Infections

  1. Conjunctivitis

    • Bacterial Conjunctivitis: Bacteria can infect the conjunctiva, the thin membrane covering the white part of the eye and the inner eyelid. This can occur due to poor hygiene, exposure to other infected animals, or a weakened immune system. Symptoms include redness, discharge (which can be clear, yellow, or green), and blinking or squinting.
    • Viral Conjunctivitis: Viruses such as canine distemper virus can affect the eyes, leading to redness and other symptoms. Vaccination is important for preventing viral diseases that can cause eye problems.
    • Fungal Conjunctivitis: In some cases, fungi can infect the eyes, especially in dogs living in humid environments or with weakened immune systems. Fungal conjunctivitis may cause redness, itching, and a thick, cheesy - like discharge.
  2. Keratitis

    • Inflammation of the cornea (the clear front part of the eye) can be caused by bacteria, viruses, or fungi. It can also be due to trauma, such as a scratch on the cornea. Redness, pain, and cloudiness of the cornea are common symptoms.

Also Read: Conjunctivitis in Dogs: Causes, Symptoms& Treatment

II. Injuries

  1. Scratches and Abrasions
    • Dogs are curious and active, and they may accidentally scratch their eyes while exploring. A scratch on the cornea or conjunctiva can cause immediate redness, pain, and excessive blinking. Foreign objects like grass seeds or small pieces of debris can also get lodged in the eye, leading to irritation and redness.
  2. Trauma
    • A blow to the head or eye area, for example, from a fall or a collision, can damage the blood vessels in the eye, resulting in redness. This can be a serious situation and may require immediate veterinary attention.

III. Other Conditions

  1. Dry Eye
    • Some dogs may not produce enough tears to keep their eyes lubricated. This can be due to certain medications, genetic factors, or autoimmune diseases. Without enough tears, the eyes become dry and red, and may also develop a thick, mucus - like discharge.
  2. Glaucoma
    • Glaucoma is a condition where there is an abnormal increase in the pressure inside the eye. This can damage the optic nerve and lead to vision loss if not treated promptly. One of the early signs is redness in the eye, along with pain, cloudiness of the cornea, and dilated pupils.
  3. Uveitis
    • Inflammation of the uveal tract (which includes the iris, ciliary body, and choroid) can be caused by infections, autoimmune disorders, or systemic diseases. Uveitis can cause redness, pain, and a decrease in vision.
  4. Allergies
    • Just like humans, dogs can be allergic to various substances in their environment, such as pollen, dust mites, or certain foods. Allergic reactions can cause redness, itching, and watering of the eyes.
dog’s red eye

What to Do if Your Dog's Eyes Are Red 

Redness in your dog's eyes can be caused by a number of things, here are some ways to deal with it.

1. Observe the symptoms

Observe your dog's eyes carefully to see if there are other symptoms in addition to redness, such as increased discharge, tearing, swelling, pain, itching, loss of vision, etc., as well as whether there is any trauma or foreign objects, so as to make a preliminary judgement of the cause.

2. Clean the eyes

Dampen a cotton ball or gauze with clean, warm water and gently wipe your dog's eyes, from the inner corner of the eye towards the outer corner of the eye, to remove eye droppings and secretions, but be careful to avoid irritating the eyes.

3. Avoid irritation

Keep your dog's living environment clean and avoid irritants such as dust, pollen and smoke, as well as avoiding your dog coming into contact with substances that may cause allergies.

4. Use eye drops

For minor inflammation or infection, you can use pet-specific eye drops or eye ointment, but choose and use them under the guidance of your veterinarian, and don't use human eye drops as they may cause adverse reactions.

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5. Seek medical attention in time

If the symptoms of redness in your dog's eyes continue unabated, worsen or are accompanied by other serious symptoms, such as cloudy cornea, ulcers, protruding eyeballs, loss of vision, etc., you should take your dog to a veterinary hospital immediately for detailed eye examination and diagnosis, so as to determine the cause of the disease and carry out targeted treatment.

6. Follow-up care

Follow the veterinarian's recommendations for follow-up care, such as using medication on time, regular review, etc. Also, pay attention to the recovery of your dog's eyes and inform the veterinarian promptly if there is any abnormality.

dog’s red eye

How to Protect Your Dog's Eyes?

To protect your dog's eyes, you can start from the following aspects:

I. Daily cleaning

  • Regular wiping of eye droppings

Use a clean, soft, damp cloth or cotton ball to gently wipe the eye droppings around your dog's eyes every day. Wipe from the inner corner of the eye to the outer corner of the eye to avoid bringing dirt inside the eye.

  • Keep the hair around the eyes tidy

Trim the hair around your dog's eyes on a regular basis, especially those long-haired breeds that tend to irritate the eyes. For example, poodles and shih tzus should be prevented from getting hair lodged in the eyes causing discomfort, inflammation or damage.

II. Healthy diet

  • Provide balanced nutrition

Make sure your dog's food contains enough nutrients such as vitamins A, C, E and omega - 3 fatty acids. These nutrients help maintain eye health. For example, foods such as liver and carrots, which are rich in vitamin A (but liver should not be consumed in excess), and fish oil, which is rich in omega - 3 fatty acids, can be added to your dog's diet in moderation.

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  • Avoid stimulating food

Do not feed your dog foods that are too salty, too spicy or contain a lot of additives, which may adversely affect your dog's eye health.

III. Environmental Management

  • Avoid strong sunlight and wind and sand

Try to avoid exposing your dog to direct sunlight for long periods of time when the sun is strong. If you need to go out, you can wear suitable goggles for your dog. At the same time, in windy and sandy weather, reduce the dog's time outside, or give the dog a protective cap and other equipment to prevent wind and sand from entering the eyes.

  • Keep the living environment clean

Regularly clean your dog's living environment to reduce the irritation of dust, hair, allergens, etc. to your dog's eyes.

IV. Prevent Disease

  • Regular deworming

Follow the veterinarian's advice to regularly deworm your dog internally and externally to prevent parasites from infecting the eyes, such as conjunctival sucking nematodes.

  • Vaccination

Vaccinate your dog in time to prevent infectious diseases such as canine distemper and canine infectious hepatitis, which may affect your dog's eye health.

Related: Hepatitis in Dogs

V. Safety precautions

  • Prevent eye injuries

When your dog is playing, running or interacting with other animals, take care to protect your dog's eyes from trauma. For example, avoid contact with sharp objects, branches, etc. Avoid intense fights between dogs.

  • Watch out for chemical exposure

Don't let your dog come into contact with toxic chemicals such as detergents and pesticides. If your dog accidentally comes into contact with these chemicals, immediately flush his eyes with plenty of water and seek medical attention.

Red Eyes in Dogs

FAQs

Can diet affect my dog's eye health?

Yes, a diet lacking in certain nutrients such as vitamin A can affect eye health. A balanced diet rich in essential nutrients is important for maintaining healthy eyes.

How can I prevent my dog from getting eye injuries?

Keep your dog away from sharp objects and dangerous areas. Also, when walking your dog, be careful of bushes and plants that could potentially scratch their eyes.

Is redness in both eyes always more serious than in one eye?

Not necessarily. The cause of the redness determines the seriousness, whether it is in one or both eyes. However, bilateral redness may be more likely to be associated with systemic issues.

How long does it take for a dog's red eye to heal?

It depends on the cause. A minor irritation may heal within a few days with proper treatment, while more serious conditions like glaucoma may require long - term management.

Is red eye in dogs an emergency?

Pink eye in dogs is not always an emergency and needs to be determined based on the specific cause and symptoms.

Conclusion

Red eyes in dogs can range from mild irritation to serious conditions like infections, glaucoma, or corneal ulcers.

🚨 If your dog’s red eye is persistent, painful, or accompanied by discharge, seek veterinary care immediately.

For mild cases, clean the eye, remove irritants, and monitor for improvement.

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