Short answer: call your vet. PDSA says to contact your vet as soon as you notice anything wrong with your dog's eyes, because a delay in treatment could lead to more serious problems.
VCA describes conjunctivitis, with signs such as discharge, squinting or excessive blinking, and redness or swelling around the eyes. It says there are many causes, so a vet needs to check. PDSA lists several things that can make eyes red or swollen, including a wound on the eye surface and eyelashes or eyelids that rub the eye.
Tell your vet what else you have noticed, such as pain. PDSA says if your dog seems to be in pain, ask for an urgent appointment. Do not use human eye drops or home remedies. See emergency signs.
Your vet can look at the eye and treat the cause.
This article is general education, not veterinary advice. If your dog seems unwell, is in pain, or something changed suddenly, call your vet. If it could be an emergency, do not wait.
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