If you are feeding puppy its a hard choice. Now for hunting dogs a lot of time they want you to have large breed puppy food. It has extra stuff in it for their brains. Although I wanted to go the natural route as the person above me said, my vet told me to wait until he was an adult to do that. It's really hard to know what to do here. I am doing what the vet says untill he is an adult. My vet recomended eukanuba, science diet, and Iams, because they carry large breed puppy food and she uses Iams for her dogs. I chose Eukanuba because it is a higher grade of iams. When my dog is older I will put in one california natural. I know we all want to be natural and everything, but how much do we really know. Do we really know as much as a vet.