This idiomatic expression can describe any kind of movement, but is especially linked to running. A scalded dog would be moving as quickly as it was capable of doing, and it would be motivated by pain and fear - that combination makes for some serious speed.

When the bandit saw the police coming, he ran faster than a scalded dog.

faster than a scalded dog by RobertPlanty April 28, 2012

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faster than a cat can lick its ass

Ever see a cat lick its ass? Then you know it's pretty damn fast.

When I heard my old man coming home right when I was in the middle of some afternoon delight with my next door neighbor, he gathered up his clothes, rock-hard dick and all, and jumped out the window faster than a cat can lick its ass.

faster than a cat can lick its ass by Goobershanker August 9, 2006

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