You may want to try a bland diet for your puppy to help keep her more balanced from one day until the next. You only have to do this for a few days. It is certainly not ok if your puppy loses hydration. You can cook regular white rice (about as much as she normally eats, maybe a little more), drain it, cool it and let her eat that. You may also boil some chicken and give her that too. That helps immensely. If this happens again, I would consider consulting another vet - it is never ok for a puppy to have continual diarrhea which will lead to dehydration as others have said.