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As if moving the Dock around and changing its size weren’t enough, there’s yet more you can do to make the Dock work just the way you want it to. The Dock preferences enable you to control the way the Dock moves—or, more precisely, the way its icons move and change size and the way windows enter the Dock.
Choose Apple menu, Dock, Dock Preferences.
Click and drag the Magnification slider toward Max if you want Dock icons to be enlarged as you pass the mouse cursor over them.
Choose an option from the Minimize windows using pop-up menu.
Click the Animate opening applications check box to make Dock icons bounce as their programs start up.
Tip: Dock Behavior in Another Context
You can control Dock Preferences by Control-clicking the dividing line between the halves of the Dock. The contextual menu has controls for magnification, hiding, position, and the minimization effect, as well as a Dock Preferences command.