MAKE ROUTINE SHOWS OF BRAVERY
It is always a good idea to show some bravery so your Mommy or Daddy knows that you are doing your job. If you hear a noise outside, you should growl or bark. Just once will do. No sense in overdoing it. You will still get the credit for bravery.
But, every once in a while, you should do more. Peeking out the windows growling and barking is really impressive. It shows your intent to attack if necessary. Make them feel that they will have to hold you back. Everyone will think you are so devoted and fiercely protective. It may even earn you some extra treats!
Here I am guarding my household from intruders. It turned out to be my Mommy's daughter and grandsons, but that's okay. My Mommy thinks I was willing to attack and maim for her safety.