Thanks guys! Sorry I didn't post earlier.
Well, my mom gave One Down some food yesterday. I think it was night-time. Today morning, his bowl was empty. She said that she saw him sniff the food, but, then he went away. Today, the bowl was empty, so, hopefully he was the one who ate the food. We don't have any other pets and I'm pretty sure no intruder came and ate his food, so, thank God, he ate something!!!
Mom gave him some food today and he just sniffed it and went away. Hopefully he'll eat it. He does look better than before, thank God!