Between 18-22 June, 2012 by 11:59 PST just login to Mafia Wars and you will be rewarded a Feral Horse (174/110). Upon logging in to the game you should get a pop-up like the one shown below;
Whether you see the pop-up or not you should verify that you have in fact received your Feral Horse. Follow these instructions to verify if you have received your Feral Horse;
1. To verify that the item has been added to your inventory, please click the Inventory tab:
2. Next you will need to click the Filter button:
3. Type 'Feral Horse' into the search field and click 'Go':
4. The following window should show that 1 Feral Horse has been added to your inventory.
If you have received your Feral Horse you can click on the image to bring up the item details and see how much the Feral Horse has increased your stats by.
If you did not receive your Feral Horse then you may need to locate your ‘Apps and Games’ in the left column of your facebook wall.
Then locate your Mafia Wars requests and the request from Mafia Wars.
To locate it faster you can click the Control (Ctrl) button and ‘F’ button, simultaneously, to bring up a dialog box where you can search for the Feral Horse request by typing the name of the item into the search box.
If you locate the request simply click the ‘Accept’ button and you should be taken into the game and receive your Feral Horse. To make sure you’ll need to verify to see if you received your Feral Horse.
If all this failed the you may need to contact Zynga support.