I do not have access here to a microscope to look at the canines, but with a magnifying glass I can say there are some lines that may suggest they were actually smoothed down.
Searching in the internet I have seen that some people choose to do that with dogs that are aggressive, like there is people who take the nails off from kittens. Apparently, some shepherds in France used to smooth down the canines of sheepdogs, to avoid them biteing the sheeps (thanks to O. Putelat for this comment).
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