The Rise and Fall of America’s Fossil Dogs

When it came time to adopt a dog, I knew I wanted a dog. An angry, yappy gremlin wouldn't do. I was on the lookout for a companion that at least somewhat resembled the gray wolf stock from which our domesticated canine companions descended. A real canid. Jet, a black German shepherd I took in earlier this summer, met that description perfectly.

But while I appreciate that Jet has a bit of ancient wolfishness about him, he's not anything like the earliest dogs. Those dawn canids, which split from their cat cousins around 50 million years ago, were more weasel-like than any modern pooch. These were little ambush predators ...

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