A word of warning on the yellow ribbon theory -- it sounds like a great idea to keep people at a distance even if your dog is not a problem.... in the off chance that a set of circumstances arose and your dog did bite or snap at someone or some other dog.... that could be used to say you KNEW that your dog had a propensity to bite.... just saying. With the sue happy society we live in, you have to think way ahead...... sort of the same thing as those Beware of Dog signs. I've heard that if something happens, they can say you knew the dog had a problem.