I share a room with my 9 year old sister (im 15).  Today she was in there while i was changing because we were both changing at the same time.  She saw my injuries and asked what  happened.  I told her that the dog jumped up and scratched me.  She doesnt know what Si is so i dont have to worry about her being suspicious or tattleing,  But what i do have to worry about is her telling people that the dog jumped up and scratched me because she has a big mouth and talks constantly.  My parents think that i dont si anymore.  The only people who know i do it are my therapist.  And one of my friends from S.A.F.E.  My psychiatrist has a pretty good idea but he doesnt know for sure because i lied to him and told him that i didnt.  WHAT DO I DO?!