Petz: Horsez 2
(Rainier, OR, USA)
I loved the game and have played it several times. You play as a girl named Lily, (sorry, no boys allowed I guess!) who originally is an amazing rider that has recently gotten a new mare for her first horse (later on getting a stallion and other horses as rewards for shows).
You get to groom your mare, clean her stall and hooves and wash her coat. Using your Wii remote and nun-chuck you steer your horse through challenging show jumping and cross country courses, trying to earn enough money to pay for your Uncle's ranch.
Truly an amazing horse game by Ubisoft.