The "beware of dog" sign has been used since the days of the Roman empire, which was a super long time ago (my high school Ancient History teacher would cringe if he saw this). So it's no surprise that it's gotten a bit stale. Here are some creative ways to let the world know that a dog lives in your house.
Wood Dog Signs // I also need one that says "You're going to get dog hair on you just by walking in my house. Deal with it."