One of the most common causes of redness in dogs is dry eye. When this occurs, it is difficult for the dog’s eye to produce moisture to protect the eye and cornea. Look to see if your dog is having trouble blinking or seems to be bothered by the eye. Scraping, pawing, and rubbing its head on the surrounding area are good indicators. If your dog is experiencing dry eye, it is likely what is called immune-mediated adenitis. This is a condition wherein the tissue and valves that control the tear ducts become damaged or blocked. Your veterinarian will need to intervene to diagnose and treat this problem.
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