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For example, a herding dog might need proportions allowing for tight turns, while some hounds might require thick paw pads for rough terrain.

Now Craig has just a few sheep and goats, some horses and a few dogs, including one herding dog named Dibé, the Navajo word for “sheep.”

On this sunny day, however, the goats are streaming down the hill to a new grazing area, egged on by the indefatigable herding dog Bernie.

A herding dog might need proportions that allow for quick, tight turns.

And because the lineages happened to cleanly fall into eight behavioral groups, it became possible to identify what parts of the genome make a herding dog different from a guarding dog, for example.