I've been trying to find something similar. The only games you can download I've found you don't have to buy are HorseStar and My Horse Club. HorseStar was glitched whenever I downloaded it as it was and still is in beta. I'm not sure what progress it's been making. My Horse Club (MHC) requires you to downgrade your java and use Internet Explorer (wouldn't suggest this) to play it. They have tons of glitches, and for different horses you have to pay. If they can't put effort into fixing their glitches and making sure the game's secure for its players, I wouldn't suggest paying, or even playing in the first place, and you can't play as a horse. However, there is a game called Whoa-Horsie coming out but you can't sign up for beta any longer. It's supposed to go into beta by June, and you can choose to play as a horse, wolf or human. The graphics aren't so great, and it's flash, but from what I know, there are no other games out there where you can play as a horse.
