Her fur on her back probably just stood up because she was excited and aggitated. I really doubt she's mixed with Ridgeback...they are very large dogs, and the ridge on their back stays that way all the time, not just when they are excitied. I think the fur on the ridge actually grows in a different direction then the rest of the fur? Nebo has areas of his back that are longer then the others. The fur on his sides is much shorter then the fur on his neck and down the middle of his back.