You need:
-Fiddler
-Any browser that requires fiddler
-Download RosieCashCheat.zip link 1 or link 2

Step by step tutorial:

1) Download the file above.
2) Open Fiddler
3) Go into Pet Society. Once loaded, find for this line in Fiddler.
http://d2syub29v5lge2.cloudfront.net/game/pets/swf/xxx/database.dat
4) Right click them > Copy URL and go to Autoresponder and click ‘Add’. Or you can use the regular expression :

regex:(?insx)^http://d2syub29v5lge2\.cloudfront\.net/game/pets/swf/.*/database\.dat$

5) Now replace the database.dat with the rosie_database.dat that you just downloaded. Click SAVE
(Click on the drop down arrow button beside the ‘Save’. Select ‘Go To File’ and browse to the place where you downloaded the file to.)
6) Find for this line in Fiddler.
http://d2syub29v5lge2.cloudfront.net/game/pets/swf/x.xxx/shops/shopMystery2102.dat

7) Right click them > Copy URL and go to Autoresponder and click ‘Add’. Or you can use the regular expression :

regex:(?insx)^http://d2syub29v5lge2\.cloudfront\.net/game/pets/swf/.*/shops/shopMystery2102\.dat$

Now replace the database.dat with the rosie_shopmystery.dat that you just downloaded. Click SAVE.
(Click on the drop down arrow button beside the ‘Save’. Select ‘Go To File’ and browse to the place where you downloaded the file to.)
9) Find for this line in Fiddler.
http://d2syub29v5lge2.cloudfront.net/game/pets/swf/x.xxx/actions.dat

10) Right click them > Copy URL and go to Autoresponder and click ‘Add’. Or you can use the regular expression:

regex:(?insx)^http://d2syub29v5lge2\.cloudfront\.net/game/pets/swf/.*/actions\.dat$

11) Now replace the database.dat with the rosie_actions.dat that you just downloaded. Click SAVE.
(Click on the drop down arrow button beside the ‘Save’. Select ‘Go To File’ and browse to the place where you downloaded the file to.)
12) Clear cache for your browser.
13) Clear cache for your browser! i cannot emphasize this enough. Go into Pet Society.
14) Go into the MysteryShop > Mysteryboxes and Eggs and you will see the items.

Enjoy!

Instructions:
You need:

1) Firefox or Internet Explorer

2) Cheat Engine 5.6

3) Flash Player 10.0

Step by step guide:

1) Start your Pet Society application and visit any friends and open Cheat engine 5.6

2) Open process list and select Internet Explorer

3) Scan “0F846A0100008B5DFC8B7308” with Hex, Array of Bytes, and also scan read memory.

4) Right click the address and Disassemble it

5) Right click the address and Replace with code that does nothing.

6) Scan “0F8F3E0400008B7DD08B872C020000” with Hex, Array of Bytes, and also scan read memory.

7) Right click the address and Disassemble it

Right click the address and stroll up to find “mov ecx, 0000000a” change it to “mov ecx, 00000001”

9) Now everytime u brush your pet 20 coins will drop out from it. Repeat the brushing till you earn 200 coins and click add coins to repeat the process. This is to prevent the mayor to appear.

10) Now simply start brushing and earn 20 coins! each time.

Repeated process to earn more coins!