It was inevitable that the Sims was going to get a Pets expansion at some point. You can build giant houses, have amazing jobs and flashy sports cars. Of course your going to need a pet too.
Unfortunately if you want the 360, PS3 or DS versions your going to have to buy a completely separate game, as for some reason it doesn’t make sense for it be included as a DLC download. For you lucky PC and Mac owners it will just be available as a download like all the other expansions and will just integrate into the existing game.
The Sims 3: Pets will have some unique features for the Xbox 360 version, including Kinect capabilities such as voice commands. And for the Nintendo DS, the built-in pedometer will give you extra Karma Points the more you walk.
You can expect horses and about a million breeds of cats and dogs* in The Sims 3: Pets this fall.
*may not be millions, probably just a couple hundred