
As Salukis arte not usually greedy I would think that the lower protein and fat levels may not be enough to keep him a good weight while he is growing. Now if he wan't eating the Puppy and wolfed down the adult and I was worried about his weight then I woudl give him the adult as at least he woudl be eating it so not loosing weight, if you get me.
I have often foudn that the pups prefer to eat what the adults have, just because it is different, but after a few days woudl ahppily eat their own food if it was in someone elses dish.