The Sims 2: Pets cheats and cheat codes for Sony PSP

Activate the cheat gnome:
While playing the game press L, L, R, X, X, Up when you are home or
in front of your house near the mailbox.

Unlock Pet points option on the Cheat gnome:
Activate the cheat gnome, then press Triangle, Circle, X, Square, L, R
during game play near the Cheat gnome.

Unlock Advance time option on the Cheat gnome:
Activate cheat gnome code, then press Up, Left, Down, Right, R
during game play.

Unlock Simoleons option on the Cheat gnome:
Activate cheat gnome code, then press Triangle, Up, Left, Down, Right
during game play in front of your house near the mailbox.

Find Monkey Paw:
Sit in a bench at town square. Press X and select "Search Bench".
Try this for several times and you will find the paw.
Note: This trick will work also, if you buy a sofa.