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My point is more along the lines of:
If you cut a dog's tail off, and then breed it, it will not produce puppies with short tails.
If a dog wears plutonium underwear, it may get a mutation of its sperm's DNA, and may have puppies with short tails.
In this case, according to the Snopes linked article, after many weeks of gestation, the fetus "has its tail cut off" when the mother is exposed to toxins which interrupt the development of the fetus. The DNA isn't altered, so the changes aren't a mutation that can be passed along to the next generation, the way evolution works.
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