An 18,000-year-old puppy buried for centuries in a lump of frozen mud was unveiled on Monday by scientists who hope it can help bridge the connection between dogs and wolves.

The puppy, which was male, was discovered 18 months ago, preserved in a layer of permafrost in Siberia’s Far Eastern reaches, according to Dave Stanton, a research fellow at the Center for Palaeogenetics in Stockholm and one of the scientists who examined its DNA.

The fur, skeleton, teeth, head, lashes and whiskers of the pup, named Dogor, are still intact, he said. But scientists don’t know whether it is a dog or wolf. Dr. Stanton said more DNA research would be conducted in the coming months.

“We need to put this information into context,” he said in an interview.

Many scientists say dogs evolved about 15,000 years ago from a species of extinct wolves. Others suggest it could have happened much earlier, perhaps 30,000 years ago or more. These wolves evolved after generations of exposure to humans, were domesticated and became the canine companions we know today.

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