Credits: davvix@cheats09
This cheat works. You will keep getting coins from the tree for as long as you want. And yes, it can be saved ONLY if you follow the steps and not be GREEDY! You will have to constantly click "Add Coins" in order to save the game. And do NOT let too many coins drop from the tree each time. Just collect a few, click "Add Coins" click tree again and repeat cycle.

Tools:
Cheat engine 5.5
Firefox
Flash 10
Steps@www.pwnthis.net:
*Play Pet's Society (click to play)
*Open Cheat Engine (Array of Bytes, Hex, Also Scan Read Only Mem)
*In PS, click the tree until you found 1 that dropped a coin.
*Scan "8B78088B8FFC0200008945D8C745DC"
*1 address returned. (if no addresses, you're either not using flash 10, or you have not done step 3)
*Right click and Disassemble
*Scroll up a few lines and you should see the code "jne XXXXXX" (X is random digits)
*Right click this line and select 'Replace with code that does nothing'
*Now in Pet's Society, click any tree and coins will keep pouring out.
*Impt: Do not leave it alone for too long!! Probably about 30-40coins click "Add Coins"
*Then click "Leave Shop"
*Then repeat step 9,10,11 till satisfied. Coins definitely can be saved if you are not greedy and collected too many coins at 1 go.