Puppy notification!

We are moving out of the country into town we have a dog and I want to be able to alert people that we do have a dog before they knock on our door (our puppy LOVES people and can be kind of overwhelming to new comers) HOWEVER I do not want to get a sign that says "beware of dog" she isn't mean! She is a pit bull and I don't want people getting the wrong idea. What kind of sign should I get?