first you must enter the cheat gnome!

The Cheat Gnome (enter during gameplay)
Cheat code: L1, L1, R1, X, X, D-pad Up.
This will activate the cheat gnome in The Sims 2: Pets on PlayStation 2.

Give Sim Pet Points
Cheat code: Triangle, Circle, X, Square, L1, R1
Note: This activates an option on the cheat gnome.

Upgrade Pet Emporium
Cheat code: Right, Down, Right, Up, Right, Down, Right, Up
Note: This will fully upgrade the Pet Emporium in Town Square.

Advance Time 6 Hours
Cheat code: Up, Left, Down, Right, R1
(this unlocks the option to advance time 6 hours on the cheat gnome)

Give 10,000 Simoleons
before you enter the Cheat Gnome you must enter Up, Left, Down, Right, R1 after that now you enter the Cheat Gnome then go to Cheat Gnome and press (x) then (traingle)to move out and press Up, Left, Down, Right, x,4x or 3x and the 10,000 Simoleons is their