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
On the title menu press up+b+select that should restart your game
You can't the game is good but stupid
You start a new game and start over.
go to new game and do what it says then you will erase your game
If your game was autosaved, then the only way to really restart the game is by starting a brand new game
Select new game