We have tried to feed our 4 week old puppies dry crushed kibble and they have not been intrested. Today they are 5 weks old and I tried something different. I mixed the dry kibble with a little bit of wet food and water to make a mush. All but 1 of the puppies LOVED it. My question is today was the first day they actually ate the puppy food. How much should I let them eat and how often shall I offer it?