At first, this Golden Retriever's owner thought his dog was simply having an eye irritation that would go away soon. However, ...

The dog's ability to close its eyelids completely ... The cornea should appear moist if the tear film is adequate. The third eyelid should be examined for inflammation, foreign bodies, abnormal ...

and the tear gland in that third eyelid can become blocked in dogs (and rarely in cats). This gland will then swell and pop out in front of their eyeball, leading to a red, cherry-like swelling ...