Okay, everytime I take Bula outside, there are always kids out there playing. She has never had a problem with them petting her. As a matter of fact, she loves the attention. But, now when the kids come to pet her, she will just sit there and shake like she is scared. She will have her tail tucked between her legs and won't move. Usually, she's licking the kids and wagging her tail. Now let me infasize, she IS NOT showing any kind of aggession, she's just scared. Do you know why she would just have a sudden change of demeanor?