My youngest sister was attacked on our front porch by the neighbor's dog when she was 4. She had several bite marks on her head. She had a psychologist from Vanderbilt come out for several sessions. She was part of a study. I can't remember everything that he did with her, but I do remember one of the exercises was that she had to stay outside with our other neighbor's Great Pyrenees for increasing amounts of time. He was a very friendly, yet obviously huge, dog, especially compared to my very petite 4 year old sister. The whole process really helped her. It may have been so beneficial because of her age at the time. I do remember that after the sessions were all over, each of the other siblings got to pick a cassette that the doctor purchased for us as a thank you for helping out. (YaY George Strait!) Perhaps there may be some information to look up online.