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If we can see the dog's face through those glasses, they're probably not safe viewing glasses. Safe ones would be entirely opaque (or mirrored) when seen from the front.
I think we're just seeing reflections that happen to be close to the dogs skin tone. However, you're completely correct, and even if they look opaque, glasses should be tested.
*fur tone
How do you test them?
Thank you for your concern :) They're opaque and the same ones I used. They just reflected light weirdly in this photo.