What happens next?

How to treat canine corneal ulcers
Watch for your dog rubbing his eye.
Since corneal ulcers are painful, the dog's eye will bother him because it hurts. This means your dog may rub his eye.

Options are: A). Try to avoid scratching the area and see if he flinches at this pain. Note any stimulus or behavior that makes your dog angry.; B). You may notice that he is rubbing his eye when in fact, the corneal ulcer is quite serious. As your dog moves closer, sees the ulcer as a sore eye, the ulcer may become infected.; C). Your dog might also squint with the affected eye and hold it partially closed. The discomfort and pain from the ulcer may also cause your dog's eye to water.; D). If you notice this recurring problem do not attempt to treat the ulcer. That will only irritate the tissues, which will reduce the pain.;
C).