For the PS2 see The Sims 2 Pets (console)

The Sims 2: Pets, or simply Pets, is the fourth expansion pack released for The Sims 2. This game was released on October 18, 2006 for US and Canada, October 20, 2006 for EU, and October 26, 2006 for Australia. The main idea of this game is to let the player own pets. The PC version is a remake of The Sims: Unleashed, which was a best-seller at that time. It is also included in The Sims 2 Fun with Pets Collection.

On the PC, this game allows the player to own pets such as dogs, cats, womrats (guinea pigs) and birds, although only dogs and cats are fully customizable in the Create-A-Pet screen. There were 72 premade breeds of dog and over 30 premade breeds of cats. Pets don't have the environmental motive; it is replaced by chewing for dogs and scratching for cats. Sims can also sell pets with the Open for Business expansion. The game features skills for pets.

A new life state was introduced again in this EP: werewolf. To become a werewolf your Sim must have a daily and lifetime relation with a "Leader of the Pack" at least 50, and the wolf will "nibble" your Sims and he or she will become a werewolf. A werewolf will have change in skills and personality eventually, and have more interaction. One can turn another Sim into a werewolf by fighting with him or her.

The Kat Family, who appeared in Unleashed, returns.