Lets not forget what Coops originally asked here, so yes, the conclusion would be that sure horses can win you more money but they can also lose you more (because all of their costs are more) as was said. By the way your talking about the half mile horse vs dog with standing start and all that... Forget the times etc. if thats the case because remember the horse would have 50+ kg on its back the dog wouldnt.

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The more you bet the more you win