It depends on the dog breed. Sighthounds are the fastest while Chihuahuas are arguably the slowest. Here's a video that should help you: http://www.YouTube.com/watch?v=vUBh-Cznm2s
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The average dog is faster than the average human,but is not as fast as the top class sprinters.So i would say about 11 seconds for the 100 meters.