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I don't know why they didn't add horses, if the xbox can survive game as big and intricate as Skyrim, I'm sure it could render a few horses.
They probably put horses in PC because of this ^On March 19, 2008, EA revealed open world, a new feature, for The Sims 3. Players can explore the world outside their Sims' homes without having to face strenuous loading times. Every house lot is now synchronized with the main neighborhood time. In previous Sims games, the time of day was separate and different for each house lot. Players can interact with every building and amenity in a city