My family just got a 2 yr old female shepherd named Spice. My wife and I have 2 kids ages 11 and 7. Spice runs away from my 7yr old even though he is very calm around her. She also backs away when we try to pet her? She never barks, even when in the presence of other dogs. I've tried to play fetch with her but she seems very uniterested. Are these normal?