Changing the size and position of your Dock in Mac OS X is a quite an easy task that many users, especially newcomers to OS X, are not familiar with.
To change the Dock size and position first open up the System Preferences from your Dock, and then click on the Dock icon.
Use the Size slider to adjust the size of the Dock to your liking. You can change the position of the Dock by selecting left, right or center option. After you’re done with the changes, simply close the window. Check out the video tutorial below for detailed step-by-step instructions.