Not Bad, but obvious glitch
Nice, simple game. Liked the shop. Giving it more of a tournament-like feel (win a ceertain number of matches, be invited to exclusive races, etc) would've been nice.
However, there was one obvious money making glitch. Go to the betting tab, and bet on the worst rated dog (10:1 odds), but bet in negative amounts of money (eg. $-9999999). When he loses, as he should, you'll lose a negative amount of money (or in other words, gain a heap)