The Sims 2: Pets Codes -

Cheat statue:
Press (x2), , (x2), during game play when you are home or in front of your house near the mailbox. 

Pet points:
Enable the "Cheat statue" code, then press , , , , , during game play near the Cheat statue. A "Pet Points" option will now appear on the Cheat statue. 

10,000 Simoleons:
Enable the "Cheat Gnome" code, then press , , , , during game play in front of your house near the mailbox. An option for more Simoeons will now appear on the Cheat statue. 

Advance time six hours:
Enable the "Cheat Gnome" code, then press , , , , during game play. An option to advance time by six hours will now appear on the Cheat Gnome.