Our expert says:
Pugs don't have the best skins or eyes. Ulcers are a common prob with pugs as the eyeball is big and do not get the lubrication it needs from the lids. The other common problem is that the skin makes a fold under the eye and cause the hair to rub on the surface of the eyeball causing the ulcer. This will need surgery if very bad. Ulcers can take weeks to heal and if the dog had a 3rd eyelid stitch you would not be able to see if the ulcer healed or not.
Get the ulcer healed first and always keep the hair short around the eyes, this may help and surgery can sometimes be prevented. Ask your vet to check for dry eye as well as this may be an underlying problem that can be treated.
Sorry, I'm not very helpfull but there is not an easy way forward with this one.
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