I get this question a lot and the answer, there is none. The size of arena depicts the time that wins that race. So, 13 seconds may win at one place and 16 at another. I'm sure there is some record time of 12. something in some arena, but that doesn't mean it's the fastest run ever because it was just ran in a smaller pen.
Actually,
I think this wiener dog has the fastest time of 5 seconds>>>>http://www.youtube.com/watch?v=oWpDOuVaYxo
http://www.youtube.com/watch?v=oWpDOuVaYxo