Electronic Arts Les Sims 3 : Animaux et Compagnie [PS3] video games. The Sims 3 Pets is an expansion pack for The Sims 3. It introduces pets, including dogs, cats, and horses, as well as new gameplay features related to pet ownership. Players can adopt pets, train them, and engage in various activities with them. The expansion pack also includes new career paths, such as veterinarian and pet trainer, and new objects and clothing items for pets and their owners.