I haven't read your pm yet, but after I saw your post, I went looking, and learned something new (twice in one day!). I hadn't made the connection that the odd colors are only in pets, not people (pets that think they are human don't count). It turns out that pet eyes are different enough from human eyes that they reflect the green light back (or white, depending) instead of red. I never noticed the effect until I had digital cameras, so I made a false assumption.
If you want to see it check this out: http://upload.wikimedia.org/wikipedia/commons/thumb/9/96/Calf-Eye-Posterior-With-Retina-Detached-2005-Oct-13.jpg/609px-Calf-Eye-Posterior-With-Retina-Detached-2005-Oct-13.jpg
Is maybe too graphic for some viewers so I linked it instead of posting a photo of a dissected calf eye.
The red light in people is from light passing through the choroid which is full of blood, bouncing off the retina and back out.
In animals the tapetum lucidum magnifies the light and helps the animal see at night.
I had a hyphema when I was in high school so I love reading about eye junk

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