Is there a pattern to winning springfield downs?

so here is an example I usually bet on the first dog no matter who it is. I have won 3 times in a row now and my past experience has shown me don't bet on the first dog to win for the 4th time so I have picked the 2nd and 3rd dog and have had mixed results didn't know if others have noticed anything like this...will post results when able...if somebody took the time to pay attention to the payouts and who won and stuff like that I feel like there has to be a patter somewhere