. “He wasn’t black. He wasn’t spotted. He wasn’t white.” Instead,
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, the Newgrange dog was probably a mongrel with fur similar to a wolf’s.
But the ancient mutt has something special in his genes — a stretch of enigmatic DNA, says Germonpré. “This Irish dog has a component that can’t be found in recent dogs or recent wolves.” That distinct DNA could represent the genetic ancestry of indigenous European prehistoric dogs, she says. Or it could be a trace of an extinct ancient wolf that may have given rise to dogs (SN: 7/13/13,
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, p. 14).
Unraveling the prehistoric mutt’s DNA may help researchers understand dogs’ history. Already,
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, comparisons of the ancient Irish dog’s DNA with that of modern dogs reveal that East Asian dogs are genetically different from European and Middle Eastern dogs,
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, the researchers have found. Other researchers may have missed the distinction between the two groups because they were working with subsets of the data that Frantz and colleagues amassed. Frantz’s team generated DNA data from the Newgrange dog and other ancient dogs,
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, but also used data from previous studies of modern dogs,
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, including the complete genomes of 80 dogs and less-complete sampling of DNA from 605 dogs,
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, a collection of 48 breeds and village dogs of no particular breed.
The distinct genetic profiles of today’s Eastern and Western dogs suggests that two separate branches of the canine family tree once existed. The Newgrange dog’s DNA is more like that of the Western dogs. Since the Irish dog is 4,
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,800 years old, the Eastern and Western dogs must have

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