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And what's also interesting about these dogs is they're just the size of their bones, the density of their bones. The limbs of these dogs were strange. And there's some ongoing research that suggests that either cats or wolves are appropriate examples for these dogs. A lot of these dogs seem almost bear-like or badger-like, even something like prehistoric sloths. They're very, if you picture a wolf, the bones are massive. And the anatomy may indicate that the way these dogs move and use their limbs might have been specifically different than other dogs, both living and fossil.