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Eyes: squinting, discharge, and sudden changes

Squinting is how pets show eye pain. Most causes are small if they are seen within a day.

Written by Dr. Maren · Reviewed March 2026 · 4 min read · Dogs and cats

A technician steadying a dog’s chin to look at its eyes with a small light.

What squinting means

Squinting is how dogs and cats show eye pain. It can mean a scratch on the surface, something caught under the lid, or pressure inside the eye. Those look alike from outside and are treated differently, so a squint is worth a visit within a day, not a week.

Discharge colors

Clear and watery is often irritation, dust, or a blocked tear duct. Thick, yellow, or green is often infection. Rust-colored staining under the eyes of a light-coated dog is usually tears and is not a problem on its own.

Older pets and sudden blindness

A blue-gray haze in an older dog's eyes is often normal aging of the lens, and those dogs still see. A sudden change in sight is different and worth a visit the same day.

A guide, not a diagnosis. If you are not sure, call. We would rather you ask.

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