Broken, boring, and repetative...
The creators of this game could have done SO MUCH MORE with The Sims 2: Pets; but they didn't. The only thing you do in this game is walk into your lobby, talk to someone, take care of their pet (which is highly repetative because there is not many things you can do to take care of them). Then you give the pet back to the person and then move onto the next customer.
The only decent part about this game is decorating your house with furnature and buying new stuff.
The reason I got this game in the first place is becuase I thought it was a first person game kind of like The Sims 2 for the Nintendo DS. Turns out, it isn't. It's actually a top down game where you click where you want to go.
In most situations that would be a good thing, as in most games for Gamecube allows you to do that and it's still pretty fun. But thats when you get to customise your house. In this game you get to buy only premade houses from the online catalog.
To top it all off, this game has MANY glitches, that can cause you to have to turn off your game. It you still want to get this game, I advise you to save about every 4 minutes, becuases the glitches can strike at any moment.
If I can give you advise from my experiences with this game, I would advise you not to buy it.