MY SISTER HAS THIS DOG THAT THESE PEOPLE GAVE HER, THIS DOGS STORY IS WAY TOO LONG TO EXP?

,, ANYWAYS THIS DOG IS SUUUUUPPPPEEERRRRR SKINNY, BASICALLY SKIN AND BONES AND FUR, LIKE THATS ALL SHE IS,,, IVE SEEN AND WORKED WITH SKINNY DOGS BUT SHE WINS THEM ALL,, SHE IS THE SWEETEST LITTLE GIRL EVER!!! OUR CONCERN FOR HER IS THAT SHE HAS DIARRHEA, AND I SAW FOR THE FIRST TIME TWO DROPS OF BLOOD SO I GUESS IT CAME OUT WHILE SHE POOPED, WHAT CAN WE DO IN THE MEANTIME,,???? UNTIL WE CAN GET THE MONEY TOGETHER TO TAKE HER TO THE VET???? PLEASE HELP US!!! :(