This is my cat Oscar. His tail lies across his back which is shown in the picture. It is generally closer to his back but I don't have a better pic. It has been like that since I can remember except it wasn't really like that when he was a kitten. As he matured, it became more bent over. It doesn't seem to bother him at all and he can still do everything fine but I am interested to find out more about it. I can't show my vet because he gets scared and puts the tail down. I thought it could be doubled-jointed, a deformity, genetic or even he broke it when he was little and it healed like this. I would be interested to hear opinions on his tail and see if anyone else has seen the same thing.