Why do Corgis have such short legs but herd big cattle?

Look at a Corgi and you might wonder: how does this tiny dog with legs like sausages boss around cattle that weigh ten times as much? It seems backwards, doesn't it? A cow could step on a Corgi like a pancake. And yet for hundreds of years, Corgis have been expert herders. The secret is in those ridiculous short legs.
Corgis were bred in Wales to herd cattle to market — a hard job that meant nipping at the heels of huge, unpredictable animals to get them moving. Most herding dogs are tall and fast, like Border Collies. But the farmers in Wales needed something different: a dog that could bite low and dodge fast.
