Cheat in pet society

When the game is loading, pres CTRL five times. When you pres CTRL for the fifth time, hold it and press the space bar three times. Type "Blue bird" wihile the game is still loading. Afterwards, you will have unlimited coins.

If you can't do it the first time, do it a few more times. It'll work then.

This actually works!
I tried it myself.

Hope I could help you! :)