The strange phenomenon was spotted by Veterinary Vision's clinical director Chris Dixon when he examined Dachshund called Margo, which had been referred for the treatment of a corneal ulcer and fungal infection.
Chris said: “I was assessing Margo’s eye and was very surprised to see a face smiling back at me.
"It perhaps doesn't bear quite the same resemblance as the Turin Shroud. Still, I've never seen anything like it before.
"The good news is that it does not appear to have affected her vision at all.”
Apparently the smiling face is still there, even after Chris performed a corneal graft.
Chris added: "I think we can safely say that Margo is a very happy dog, both inside and out!"
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