Strange genetic mutations are turning Whippets into Superwhippets.

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“Bully whippets,” as the heavyset dogs are known, turn out to have a genetic mutation that enhances muscle development … The scientists found that the same mutation that pumps up some whippets makes others among the fastest dogs on the track.

Scientists also discovered that with these mutations, whippets are able to nip your ankle 4 times faster and twice as hard.