Easy Money & Pet Affinity
For easy money, buy a painting, get the LAST painting medal and paint for 2 game hours and a half (not real hours). So you can get lots and lots of money
Do this many times, until you have enough $ to buy a penguin from the treasure shop. Place the penguin, go to it, pet it, and you can get easy pet affinity.
We have more cheats and tips for this game here, The Sims 2: Pets cheats
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