I HAVE A NEWBORN PUPPY THAT I HAVE ADOPTED YESTERDAY,

I HAVE A NEWBORN PUPPY THAT I HAVE ADOPTED YESTERDAY, THE PUPPY HAD LOTS OF FLEAS,TIK BITES AND HIS SKIN IS EVEN BRUISED, WE HAVE WASHED HIM YESTERDAY WITH TIK SOLUTION, BUT HE SEEMS TO BE VERY WEAK TODAY AND HAVING A RUNNING TUMMY, I DECIDED TO STOP HIM FROM THE NORMAL COW MILK AND WENT TO BUY HIM EVAPORATED COW MILK MEDIUM FAT...BUT STILL THE TUMMY IS RUNNING CONSTANTLY AND HAS A LUMP CLOSE TO HIS THROAT AND UNDER HIS CHIN..PLEASE ADVICE WHAT HOME REMEDY I CAN USE AT THIS POINT.