The eyes are soooo tricky. Entropion could always be secondary to swelling, and can come and go depending on the swelling of the eye. If you can never see the inner eyelid, then it's a bad case. Also sometimes the more wrinkles in the face the more likely to have entropion. Also, as their heads grow in the 2nd and 3rd year and their wrinkles continue to change, it is not uncommon for it to show up even at the age of three, or if they do have it, it can go away on it's own as the skull changes.
I would personally evaluate the severity of his case over a month or two with using lubricating eye drops and look at his eyes daily. For anesthesia, on an eye surgery, typical protocol would be propofol and isoflourane.
Here is an example of the inner eyelid lining showing very nicely. I remember I use to line that part of my eye with eyeliner back in the 80's and 90's LOL
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