The Sims 3: Pets. It's only available for horses. It's possible that it conflicts with the Hates to Jump trait.
Agile horses are nimble, strong and love to jump. They make awesome Show Jumping competitors but get bored if they don't stay active.
- Horse will learn Jumping Skill considerably faster.
- Horse gets a slight score bonus on Jumping and Cross-Country competitions.
- Exercise motive drops at a slightly increased rate.