From the back of the case:
Your Littlest Pet Shop comes to life!
Collect 32 of your favourite Littlest Pets; explore four unique worlds with your pets - a winter wonderland, a lush jungle, a pretty garden and Pet Plaza. Earn Kibble coins as you go on adventures, play the mini-games, and build your own Littlest Pet Shop.
In Fall 2008, the Littlest Pet Shop was released for Wii, Microsoft Windows, and Nintendo DS. For Nintendo DS, the game was initially released in three versions: Jungle, Garden and Winter, each with different pets. A fourth DS version, Spring, was released in March 2009. The Wii version has all the pets from the DS versions (excluding Spring edition). The PC version is the same as the Wii. The DS versions contained 20 pets and featured over 150 accessories for them.
Source: Wikipedia, "Littlest Pet Shop (video game)", available under the CC-BY-SA License.