Conjunctivitis is the most common eye problem that occurs in dogs, according to Vet Info. Tissue, called conjunctiva, lines the eyelids and attaches to the eyeball near the cornea. Inflammation or infection of this tissue is conjunctivitis. The inflamed white of the eyeball may appear red or pink, which is why conjunctivitis is also called pink eye or red eye.
The causes of conjunctivitis include irritation caused by allergies and infections caused by viruses, bacteria or fungi. Conjunctivitis may also be a symptom of a more serious condition, such as distemper, so evaluation by a veterinarian is important. Canine conjunctivitis symptoms vary, depending on the cause.
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Inflammation and Swelling
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Both allergies and infections cause inflammation and swelling of the conjunctiva, which leads to a severe redness of the eye. Also, the dog's third eyelid swells and stays partially closed.
Squinting and Eye Rubbing
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A dog with conjunctivitis squints its eyes. The dog may also rub the affected eye(s) with a paw or on carpet or furniture due to the pain.
Eye Discharge
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Both allergies and infections can cause a discharge from the affected eye. The color and consistency of the discharge depend on the cause of the dog's conjunctivitis. Allergies usually cause a thin, mostly colorless discharge. Infections tend to create a thick yellow or greenish pus that may cause the dog's eyelids to stick together when the dog closes its eyes.
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