NZGamer has a preview of Pets. They got to see it up close at E3. Source: SimsVIP

I was pleased to see however, that The Sims 3: Pets isn’t just a quick add-on that adds a bunch of cats and dogs to your virtual neighbourhood. Instead, every single animal in the game becomes a new playable character that not only interacts with your Sims, but has their own life story as well. Personally it was quite fun just running around as a Bull Mastiff defecating on things, digging holes in people’s yards and attacking mailmen.