Trying to create a Listener pattern style class, observers won't get notified

I'm now learning about the Listener or Observer-Observable design patter, i tried to implement my own class using the supplied Java library Observer interface and Observable class.

My Observable subject is an empty class that extends Observable.

Here are my two Observer classes:

public class CatObserver implements Observer {
    private String status = "Sleeping...";
    @Override
    public void update(Observable o, Object arg) {
        System.out.println("Updated!");
        this.status = "Awake!";
    }

    public void getStatus(){
        System.out.println(status);
    }
}

public class DogObserver implements Observer {
    private String status = "Sleeping...";
    @Override
    public void update(Observable o, Object arg) {
        this.status = "Awake!";
    }

    public void getStatus(){
        System.out.println(status);
    }
}

Here is my main program:

public class Listener {
    public static void main(String[] args) {
        AnimalSubject subject = new AnimalSubject();

        CatObserver mitsy = new CatObserver();
        DogObserver ozil = new DogObserver();

        mitsy.getStatus();
        ozil.getStatus();

        subject.addObserver(mitsy);
        subject.addObserver(ozil);

        synchronized (subject){
            subject.notifyAll();
        }

        mitsy.getStatus();
        ozil.getStatus();

    }

My output is 4 lines of "Sleeping...", when it should be 2 lines of "Sleeping..." and 2 lines of "Awake!".

When debugging it won't even go into the update() functions.

What am I doing wrong here?