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.
What the sources say
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.
What to do
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.
Get the right help
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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Sources
Sources & care notes
Frequently asked questions
How soon should I call the vet about red eyes?
As soon as you notice it. A delay in treatment can turn a small problem into a serious one.
What signs matter most?
Discharge, squinting or excessive blinking, and redness or swelling around the eyes.
What should I tell the vet?
What you noticed, when it started, and whether your dog seems to be in pain. Pain makes it urgent.
Can I try human eye drops?
No. Human drops and home remedies are not for dogs. The vet can look at the eye and treat the cause.
