All the pups iv had have been 6 weeks or older but they have all been on raw diet from the word go. There is always a bowl of kibble in the kitchen in case they want more but it lasts for months because the raw is enough. Chicken is good and easiest for them to deal with but red meat is important too in order to balence the diet out. Also they do need a sourse of calcium so make sure they get a bit of bone. The occaisional boiled egg is good. So is tins of fish (sardines, tuna, kippers). As has been said not in brine. The tins of fish in tomatoe sauce or oil are fine.