How to use prototype pattern with correct meaning?

I am trying to understand the Prototype desgining pattern.

Here is the sample code.

public class App {
    public static void main(String[] args) {


        //Prototype proto = new Prototype();

        Dog d = new Dog();

        Dog clone ;//= (Dog)proto.getClone(d);

        clone = (Dog) d.makeCopy();

        System.out.println(d);
        System.out.println(clone);
        System.out.println("xxxxxxxxxxxxxx");

        //System.out.println();
        //d.setval("test");
        //System.out.println(clone.getVal());

    }
}

It is clear how a clone of dog is created in a prototype.

Dog d = new Dog();
Dog clone ;
clone = (Dog) d.makeCopy();

But without doing all these steps, can't we simply do this?

Dog d = new Dog();
Dog clone = d;

The only usage I can think of is dynamically creating clone objects through Prototype as we can pass any subclass of superclass of Dog type.

Am I correct? Or is there anything else that needs to add to this?