You can't restart your pet but you can change the image of your pet by going to the stylish and change the image of your pet (by the way if your going to change the image of your pet you also need to pay for it)
One can not really restart Dragon City on Facebook. The only real way to restart this game is to start a new Facebook. One may be able to delete things and what not, but it wont ever restart the whole game.
as far as im asware of the only way you can reset any game on facebook is if you make a new acount
Create a new facebook account
The only way you can restart your YoVille profile is if you create a new Facebook/MySpace account.
Make a new facebook. theres no way to rset it
You can't restart Empire and Allies only if it has menu that says new game wheres the restart button
To restart FarmVille 2, you can either uninstall and reinstall the game or create a new account through a different platform, such as Facebook or Zynga. If you want to reset the game on the same account, you may need to contact Zynga support for assistance, as there's no built-in option to reset progress. Make sure to back up any important data before proceeding with a restart.
On the title menu press up+b+select that should restart your game
go to new game and do what it says then you will erase your game
You start a new game and start over.
You can't the game is good but stupid
If your game was autosaved, then the only way to really restart the game is by starting a brand new game