I have an older dog, now at least, who has been on raw since 1 June 2010. Last year we noticed problems with severe constipation so we added 1/2 cup of pumpkin to his daily diet each morning. If we try to add more bone than a small turkey neck twice a week it's too much. Sometimes I only feed him one large turkey neck a week. Right now he gets between 13 and 14 ounces raw meat or organ or combination with bone for each meal fed twice a day. So is that enough bone? Is it supposed to be 10% of their diet? Could it be less?