i just after trying some other stuff that gave them hair balls and such, use this one kind of bunny food at wal-mart: small world rabbit. as id tried the others there and at other places, and they being show stock dutch, actually do great on it, and only eat two cups a day about between them. sometimes cheap and simple is the best it turned out this time, and aside from some occasional treats, veggies and greens, they are up on a grate and can say their poop is fine and all getting, except when out will eat chicken, and especially pigeon poop (why i dont know, but it seems to make them get a thick glossy coat). my old buddy used to by the blue brand or whatever and his constantly had hairballs and constipation etc.