My resuce cat who is very nervous, stayed out late on thursday night. When she came in she seemed ok but did hide in a new place. The next day she eat nothing and stayed in her bed all day. In the eve we did manage to get her to eat a small amount of food. She again later ran upstairs to hide. Today she seems a bit better, but I have noticed that her tail is hanging down. when I went to touch it she hissed loudly. yesterday I noticed she seemed to clean around her back passage, but I think now she was maybe licking her tail. Has anyone any ideas?