To find it, you'll need to:
1. Locate the valve cover: This is the topmost part of the engine, usually made of metal or plastic. It's a fairly large component.
2. Look for a small, usually plastic, valve with a hose attached: The PCV valve is relatively small and often has a single hose connected to it. The other end of that hose will usually connect to the intake manifold.
3. Consult a repair manual: A repair manual specific to your 1997 Dodge Dakota V6 engine will show you a diagram with the exact location. This is the best way to be certain. You can often find these manuals online (sometimes for free, sometimes for purchase) or at auto parts stores.
Important Note: Always be careful when working around hot engine components. Let the engine cool completely before attempting to locate or service the PCV valve.