How do I get my puppy to eat out of his bowl?

So I just adopted a 4 month old long haired chihuahua from the pound and we got all the supplies and toys for him but for some reason he won’t eat out of the bowl, he’ll drink out of his water bowl which is the same as the other, but won’t eat out of it. Now if I pick up the food he’ll eat it out of my hand or if i drop it on the floor he’ll eat it. I even tried putting the food into another bowl but no luck! This is dry and wet food! Help!?