I must admit to giving our dogs some NatureDiet mixed in with their mince & chicken wings although not for every meal( I haven't used the JWB since giving them bones etc.) & so far their tummies have been alright. Spike has a lead-lined digestion so I guessed not much would upset him but Domino did bring a few pieces of bone & bile up early in the morning but that seems to have settled down now. They have also had liver & hearts & my butcher makes up pet mince from the offal & innards he gets but Domino is really not keen on that at all. Needless to say it doesn't touch the sides with Spike!!