Pets become full members of the Sim household — living with their family from puppyhood or kittenhood, developing personalities (smart, friendly, silly, hyper), and responding to the time invested in them. Players can adopt dogs, cats, or guinea pigs, selecting from over twenty dog breeds and fifteen cat breeds or building a custom animal from scratch. Dogs and cats learn tricks through training. The central town park gives Sims and their animals a shared social space, and local shops carry accessories and supplies. Pets age alongside their Sim families.