Dogs really vary as to how much bone they need or can cope with. it may be that they are still adjusting and will be able to digest the bone content n the future. For now feed alongside bone free meals to 'dilute' the bone content. Beef Nutriment is bone free, or just feed plain meat or tripe. Nutriment do a great mix called 'Just Offal' which is good for feeding alongside the bonier varieties, it is tripe, heart, liver and kidney.