The Sims 2: Pets is the fourth expansion pack released for The Sims 2, released on October 18, 2006 for U.S. and Canada, October 20, 2006 for EU, and October 26, 2006 for Australia. The main concept of this expansion pack is to allow the player to own and raise pets. The Sims 2: Pets is a remake of The Sims: Unleashed, which was a bestseller at that time. The expansion pack is also included with The Sims 2 Fun with Pets Collection.
Pets was the last expansion pack for The Sims 2 that was developed by Maxis Emeryville; the following expansion pack, Seasons, and all others thereafter, were developed by The Sims Studio.