SOME DOGS need their space. That's the message of TheYellowDogProject.com, which is raising awareness of the meaning of a yellow ribbon on a dog's leash. The ribbons mean that a dog may be fearful, aggressive or even too fragile to be pounced on by friendly people or dogs. Sometimes the situation is temporary and the dog is being rehabilitated, either physically or mentally. But sometimes the Yellow Ribbon status is permanent. The website says that the concept is based on putting a ribbon on a horse's tail, to indicate an animal who may kick.