If a dog has corneal ulcers, which is like a divot in the cornea, they will affect the ability of light to pass through the cornea, inhibiting the vision of the dog. [substeps] Signs include your pug holding its eye closed or squinting a lot.
[header] How to diagnose eye problems in pugs [title] Spot the signs of corneal ulcers. [step] The cornea is the transparent layer on the front part of the eye. In order to see, light needs to pass through it to reach the lens and the retina.