What happens if a dog’s cherry eye is left untreated?

A dog’s cherry eye, also called prolapsed third eyelid gland, if left untreated can cause problems. First, it may cause eye pain and discomfort—itching, burning, pain. Second, poor tear drainage invites infection with redness, swelling and more discharge.

Finally, it can impair vision, causing blur or blindness. So seek veterinary treatment promptly.