Simply go to the “Get Pet Coins and Cash” link above the gameplay window, and you’ll see the following, placed below the area where you’d actually choose to purchase Pet Coins or Pet Cash.
Clicking on the 4 Cash button brings up a new window where you’ll be able to click and drag on various portions of a Kia Soul car commercial, reorganizing the commercial anyway that you want. The commercial stars the famous Kia Hamsters, so it is worth taking the time to watch the cuteness unfold when you’ve finished your editing.
After you’re done, keep hitting the Next button until you are eventually informed that you’ve received your free Pet Cash. Refresh the PetVille game page and voila – your total will be 4 Cash higher!
Make sure to head over to the game’s page sooner, rather than later, because this promotion won’t last forever.