Giro Pets http://www.giropets.net/
GiroPets is an multiplayer online game where you can create (or adopt) a virtual pet ( 25 species to choose from ) and take care of it, feeding and playing with them, and even training them for The Arena in the University. You can also buy and sell a variety of different kinds of items, own your own Stand in the Flea Market, communicate with other GiroPets members, and play games in the GameRoom.