Seriously? All you do is just guess? Even other betting games let you cheat or something... Not only that, but all your animal sprites appear to be chosen out of the blue. Work on this some more, and maybe, just maybe, this will actually turn out to be a decent game.
I picked your score randomly; it happened to be 0
The appeal of a game like this would be in the sound and visuals, and frankly it looks like you just threw together whatever you could find; the sprites aren't even anti-aliased properly for a green background. The sounds are terribly annoying. As for winning, the chance (if it's truly random) is about 1 in 3000 (5^5). I really couldn't care less about happening to hit that chance. Go back and take the time to craft graphics and sounds. You should skin those default Flex buttons, too.
Not that great
this would be alot better if you have money to bet on the animals and it would show the chances of them winning or losing. Also clicking on the animals is WAY too specific, its hard as hell to click on the one you want cuz the area is so small! And wat the hell is with the sound that plays during the race? I understand its the sounds of all the animals and a crowd, but it sounds like something demonic! O_o