A 3 week old puppy lying shivering in a cardboard box with diarrhea - crying and calling for mom

A 3 week old puppy lying shivering in a cardboard box with diarrhea - crying and calling for mom
A 3-week-old puppy was lying tremblingly in a cardboard box. He was abandoned just because he was sick. When he was picked up, he was all dirty. He was crying and calling for his mother. He immediately took him to the hospital for a physical examination. Because it is too small, even the hospital is not willing to accept it...