Is it turning green or does it have a strong smell. Trust me they smell pretty bad when they turn. If not, then go ahead and salt it. When you are ready to tan the hide, the first step is to soak it up. If you notice some of the hair slipping then it is too late and the hide won't turn out. Luckily at this point you have only used a couple dollars of salt.
You can still make leather with it.
Good Luck